diff --git a/src/ductless.ts b/src/ductless.ts
index 62095a9..798eee7 100644
--- a/src/ductless.ts
+++ b/src/ductless.ts
@@ -20,6 +20,9 @@ export class KumoPlatformAccessory_ductless {
   private Fan: Service;
   private PowerSwitch: Service;
   private Dehumidifier: Service;
+  private Humidity: Service | null;
+  private HumidityBattery: Service | null;
+
 
   private lastupdate;
   private lastquery;
@@ -34,6 +37,16 @@ export class KumoPlatformAccessory_ductless {
   ) {
     this.directAccess = this.platform.config.directAccess;
 
+    const useExternalSensor = this.directAccess &&
+      this.accessory.context.device.activeThermistor !== undefined &&
+      this.accessory.context.device.activeThermistor !== 'unset';
+
+    if (useExternalSensor) {
+      this.platform.log.info('device %s uses external sensor %s',
+        this.accessory.context.serial,
+        this.accessory.context.device.activeThermistor);
+    }
+
     // determine device profile and additional sensors to tailor accessory to
     // the capabilities of the kumo device
     // (not yet implemented)
@@ -79,6 +92,21 @@ export class KumoPlatformAccessory_ductless {
     this.Fan.setCharacteristic(this.platform.Characteristic.Name, 'Fan');
     this.PowerSwitch.setCharacteristic(this.platform.Characteristic.Name, 'Power');
 
+    this.Humidity = useExternalSensor ? this.accessory.getService(
+      this.platform.Service.HumiditySensor) || this.accessory.addService(this.platform.Service.HumiditySensor) : null;
+
+    this.HumidityBattery = useExternalSensor ? this.accessory.getService(
+      this.platform.Service.Battery) || this.accessory.addService(this.platform.Service.Battery) : null;
+
+    if (this.Humidity) {
+      this.Humidity.setCharacteristic(this.platform.Characteristic.Name, 'Humidity Sensor');
+    }
+
+    if (this.HumidityBattery) {
+      this.HumidityBattery.setCharacteristic(this.platform.Characteristic.Name, 'Humidity Sensor Battery');
+      this.HumidityBattery.setCharacteristic(this.platform.Characteristic.ChargingState, this.platform.Characteristic.ChargingState.NOT_CHARGEABLE);
+    }
+
     // create handlers for characteristics
     this.HeaterCooler.getCharacteristic(this.platform.Characteristic.Active)
       .on('get', this.handleActiveGet.bind(this))
@@ -147,6 +175,11 @@ export class KumoPlatformAccessory_ductless {
     //   .on('get', this.handleDehumidiferActiveGet.bind(this))
     //   .on('set', this.handleDehumidiferActiveSet.bind(this));
 
+    if (this.Humidity) {
+      this.Humidity.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity)
+        .on('get', this.handleHumidityGet.bind(this));
+    }
+
     this.updateDevice();
 
     // setup interval for updating device for historyService
@@ -239,6 +272,14 @@ export class KumoPlatformAccessory_ductless {
     callback(null, this.Dehumidifier.getCharacteristic(this.platform.Characteristic.On).value);
   }
 
+  async handleHumidityGet(callback) {
+    if (!this.Humidity) {
+      return;
+    }
+    await this.updateAccessoryCharacteristics();
+    callback(null, this.Humidity.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity).value);
+  }
+
   async updateAccessoryCharacteristics() {
     // updateAccessoryCharacteristics
 
@@ -259,6 +300,7 @@ export class KumoPlatformAccessory_ductless {
     this.updateFanSwingMode();
     this.updatePowerSwitchOn();
     this.updateDehumidifierSwitchOn();
+    this.updateCurrentRelativeHumidity();
 
     //this.platform.log.debug('updateAccessoryCharacteristic completed (%s)', this.accessory.context.serial)
     return true;
@@ -306,12 +348,47 @@ export class KumoPlatformAccessory_ductless {
         return false;
       }
       this.platform.log.debug('%s (queryDevice_Direct): success.', this.accessory.displayName);
+
+      if (this.Humidity) {
+        this.platform.log.debug('querying external sensors on %s', this.accessory.context.serial);
+        const sensorData = await this.platform.kumo.queryDeviceSensors_Direct(this.accessory.context.serial);
+        if (sensorData) {
+          this.accessory.context.sensors = sensorData;
+        }
+      }
     }
 
     // update device contect
     this.accessory.context.device = device;          
     return true;
-  } 
+  }
+
+  private updateCurrentRelativeHumidity() {
+    if (!this.Humidity || !this.HumidityBattery) {
+      return;
+    }
+    let currentValue: number = <number>this.Humidity.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity).value;
+    if (this.accessory.context.sensors && this.accessory.context.sensors.length) {
+      const ourSensor = this.accessory.context.sensors[0];
+      currentValue = ourSensor.humidity;
+      this.platform.log.debug('setting humidity to %s', currentValue);
+
+      if (ourSensor.battery) {
+        if (ourSensor.battery < 10) {
+          this.platform.log.warn('!!!The sensor attached to device %s has a low battery!!!', this.accessory.context.serial)
+
+          this.Humidity.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_LOW);
+          this.HumidityBattery.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_LOW);
+        } else {
+          this.Humidity.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_NORMAL);
+          this.HumidityBattery.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_NORMAL);
+        }
+
+        this.HumidityBattery.updateCharacteristic(this.platform.Characteristic.BatteryLevel, ourSensor.battery);
+      }
+    }
+    this.Humidity.updateCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity, currentValue);
+  }
 
   private updateHeaterCoolerActive() {
     // HeaterCooler Active
diff --git a/src/ductless_simple.ts b/src/ductless_simple.ts
index 0ec3ed0..0c5bd42 100755
--- a/src/ductless_simple.ts
+++ b/src/ductless_simple.ts
@@ -16,6 +16,8 @@ import { KUMO_LAG, KUMO_DEVICE_WAIT } from './settings';
  */
 export class KumoPlatformAccessory_ductless_simple {
   private HeaterCooler: Service;
+  private Humidity: Service | null;
+  private HumidityBattery: Service | null;
 
   private lastupdate;
   private lastquery;
@@ -30,6 +32,16 @@ export class KumoPlatformAccessory_ductless_simple {
   ) {
     this.directAccess = this.platform.config.directAccess;
 
+    const useExternalSensor = this.directAccess &&
+      this.accessory.context.device.activeThermistor !== undefined &&
+      this.accessory.context.device.activeThermistor !== 'unset';
+
+    if (useExternalSensor) {
+      this.platform.log.info('device %s uses external sensor %s',
+        this.accessory.context.serial,
+        this.accessory.context.device.activeThermistor);
+    }
+
     // set accessory information
     if (accessory.context.zoneTable.unitType !== undefined && accessory.context.zoneTable.unitType !== null) {
       const unitType: string = this.accessory.context.zoneTable.unitType;
@@ -47,9 +59,24 @@ export class KumoPlatformAccessory_ductless_simple {
     this.HeaterCooler = this.accessory.getService(
       this.platform.Service.HeaterCooler) || this.accessory.addService(this.platform.Service.HeaterCooler);
 
+    this.Humidity = useExternalSensor ? this.accessory.getService(
+      this.platform.Service.HumiditySensor) || this.accessory.addService(this.platform.Service.HumiditySensor) : null;
+
+    this.HumidityBattery = useExternalSensor ? this.accessory.getService(
+      this.platform.Service.Battery) || this.accessory.addService(this.platform.Service.Battery) : null;
+
     // set sevice names.
     this.HeaterCooler.setCharacteristic(this.platform.Characteristic.Name, 'Heater/Cooler');
 
+    if (this.Humidity) {
+      this.Humidity.setCharacteristic(this.platform.Characteristic.Name, 'Humidity Sensor');
+    }
+
+    if (this.HumidityBattery) {
+      this.HumidityBattery.setCharacteristic(this.platform.Characteristic.Name, 'Humidity Sensor Battery');
+      this.HumidityBattery.setCharacteristic(this.platform.Characteristic.ChargingState, this.platform.Characteristic.ChargingState.NOT_CHARGEABLE);
+    }
+
     // create handlers for characteristics
     this.HeaterCooler.getCharacteristic(this.platform.Characteristic.Active)
       .on('get', this.handleActiveGet.bind(this))
@@ -79,6 +106,11 @@ export class KumoPlatformAccessory_ductless_simple {
     this.HeaterCooler.getCharacteristic(this.platform.Characteristic.SwingMode)
       .on('set', this.handleFanSwingModeSet.bind(this));
 
+    if (this.Humidity) {
+      this.Humidity.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity)
+        .on('get', this.handleHumidityGet.bind(this));
+    }
+
     this.updateDevice();
 
     // setup interval for updating device for historyService
@@ -138,6 +170,14 @@ export class KumoPlatformAccessory_ductless_simple {
     callback(null, this.HeaterCooler.getCharacteristic(this.platform.Characteristic.SwingMode).value);
   }
 
+  async handleHumidityGet(callback) {
+    if (!this.Humidity) {
+      return;
+    }
+    await this.updateAccessoryCharacteristics();
+    callback(null, this.Humidity.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity).value);
+  }
+
   async updateAccessoryCharacteristics() {
     // updateAccessoryCharacteristics
 
@@ -155,6 +195,7 @@ export class KumoPlatformAccessory_ductless_simple {
     this.updateCurrentTemperature();
     this.updateFanRotationSpeed();
     this.updateFanSwingMode();
+    this.updateCurrentRelativeHumidity();
     
     //this.platform.log.debug('updateAccessoryCharacteristic completed (%s)', this.accessory.context.serial)
     return true;
@@ -202,6 +243,15 @@ export class KumoPlatformAccessory_ductless_simple {
         return false;
       }
       this.platform.log.debug('%s (queryDevice_Direct): success.');
+
+      if (this.Humidity) {
+        this.platform.log.debug('querying external sensors on %s', this.accessory.context.serial);
+        const sensorData = await this.platform.kumo.queryDeviceSensors_Direct(this.accessory.context.serial);
+        if (sensorData) {
+          this.accessory.context.sensors = sensorData;
+        }
+      }
+
     }
 
     // update device contect
@@ -316,6 +366,33 @@ export class KumoPlatformAccessory_ductless_simple {
       temp: currentValue,
     });
   }
+
+  private updateCurrentRelativeHumidity() {
+    if (!this.Humidity || !this.HumidityBattery) {
+      return;
+    }
+    let currentValue: number = <number>this.Humidity.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity).value;
+    if (this.accessory.context.sensors && this.accessory.context.sensors.length) {
+      const ourSensor = this.accessory.context.sensors[0];
+      currentValue = ourSensor.humidity;
+      this.platform.log.debug('setting humidity to %s', currentValue);
+
+      if (ourSensor.battery) {
+        if (ourSensor.battery < 10) {
+          this.platform.log.warn('!!!The sensor attached to device %s has a low battery!!!', this.accessory.context.serial)
+
+          this.Humidity.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_LOW);
+          this.HumidityBattery.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_LOW);
+        } else {
+          this.Humidity.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_NORMAL);
+          this.HumidityBattery.updateCharacteristic(this.platform.Characteristic.StatusLowBattery, this.platform.Characteristic.StatusLowBattery.BATTERY_LEVEL_NORMAL);
+        }
+
+        this.HumidityBattery.updateCharacteristic(this.platform.Characteristic.BatteryLevel, ourSensor.battery);
+      }
+    }
+    this.Humidity.updateCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity, currentValue);
+  }
   
   private updateFanRotationSpeed() {
     // FanRotationSpeed
diff --git a/src/kumo-api.ts b/src/kumo-api.ts
index 7f0f0cd..217022f 100644
--- a/src/kumo-api.ts
+++ b/src/kumo-api.ts
@@ -63,6 +63,13 @@ interface KumoDeviceDirectInterface {
   vaneDir: string,
 }
 
+interface KumoSensorData {
+  battery: number;
+  humidity: number;
+  temperature: number;
+  uuid: string;
+}
+
 export type KumoDeviceDirect = Readonly<KumoDeviceDirectInterface>;
 
 // Renew Kumo security credentials every so often, in hours.
@@ -354,7 +361,7 @@ export class KumoApi {
     return true;
   }
 
-  // querying sensors (not implemented as not available to test)
+  // querying sensors
   async queryDeviceSensors_Direct(serial: string) {
     const data = await this.directRequest('{"c":{"sensors":{}}}', serial);
     if(!data){
@@ -362,14 +369,13 @@ export class KumoApi {
     }  
     this.log.debug(util.inspect(data, { colors: true, sorted: true, depth: 3 }));
 
-    const deviceSensors = [] as any;
+    const deviceSensors = [] as KumoSensorData[];
     try {
       const sensors = data.r.sensors;
       for(const sensor in sensors) {
         if(sensors[sensor].uuid !== null && sensors[sensor].uuid !== undefined) {
           this.log.debug('Found sensor.uuid: %s', sensors[sensor].uuid);
-          const uuid:string = sensors[sensor].uuid;
-          deviceSensors.push(uuid);
+          deviceSensors.push(<KumoSensorData>sensors[sensor]);
         }
       }
 
diff --git a/src/platform.ts b/src/platform.ts
index 50c7f2b..896ad12 100644
--- a/src/platform.ts
+++ b/src/platform.ts
@@ -203,7 +203,7 @@ export class KumoHomebridgePlatform implements DynamicPlatformPlugin {
           if(this.config.simpleDuctless) {
             new KumoPlatformAccessory_ductless_simple(this, accessory);
           } else {
-            new KumoPlatformAccessory_ductless(this, accessory);  
+            new KumoPlatformAccessory_ductless(this, accessory);
           }
         } else {
           this.log.info('Initializing "%s" of unitType "%s" as generic (unspecified) unit.',