Wireless brightness twilight sensor pure white with solar cells and battery (lifetime 5-8 years). For indoors and outdoors. lxwxh: 60x46x30mm. The sensor covers the range from 0 to 30000 lux. Actuators can cover the range from 0 to 50 Lux using the twilight switch function. The wireless sensor can be taught in the actuators listed below and in Professional Smart Home controller: FKLD61, FLC61, FLD61, FRGBW71L, FSB14, FSB61, FSB71, FSG14, FSG71, FSR14, FSR61, FSR71, FUD14, FUD71, FUD61.