Friends of Hue wireless wall transmitter set 4-channel, AS/A series, alpine white 4-channel max. 4 light scenes including mounting plate, adhesive film and fastening screws Smart light switch for wireless remote control of Philips Hue lamps For switching, dimming and controlling individual light scenes For use in living areas Installation on device box with dimensions according to DIN 49073, screw fastening on walls or adhesive mounting on smooth surfaces (glass panes) Battery-free device without external power supply Transmission energy is generated from mechanical energy when activated (energy harvesting) Encrypted transmission with device-specific code Radio standard ZigBee Green Power, compatible with Friends of Hue and Apple HomeKit Range extension automatically via Philips Hue lamps Easy commissioning and configuration via Philips Hue app and Hue Bridge from V2 Radio frequency: 2.402 ... 2.480 GHz Transmission range in the open field: up to 175 m in buildings: approx. 20 m Transmission power: 7 dBm / 5 mW Ambient temperature: 5 ... +45 °C Storage/transport temperature: 25 ... +65 °C Humidity: 0 ... 95 % (no condensation)