Features:- Waterproof design.- One transmitter and two receivers.- Adjustable volume with four levels- 36 different tunes for your choice.- High quality ABS material with LED light.- Long distance transmission and high strength signal and sensitivity.- Wireless designed for easy install and operates.- Effectively reminds you of the coming of guests or friendsSpecifications:Model: forecum 5fColor: White & Black.Control area: <100m (109 yard)Temperature resistance: -10≧~50≧ (14・~122・・Transmitter:Operating frequency: 315MHZWorking Voltage: 12VOperating current: ・15mAWeight: 37g (1.3 oz)Receiver:Tones Kinds: 36Operating frequency: 315MHZVoltage: 4.5V (battery type: 3 x AAA not included)Operating current: ・80mAQuiescent current: ＋0.8mAPower: ・2WControlled volume: 25-80dBWeight: 64g (2.26 oz)Package includes:2 x Wireless Electronic Doorbell Receiver1 x Doorbell Button