Features:  3 working mode: Music mode; Music + flash mode; Night light + music + flash mode.  Waterproof transmitter, suitable for indoor/outdoor installation; Two installation methods: double-sided tape and screw.  Adopt digital same frequency different code technology, 256 kinds of code adjustable (double turntable), anti-interference ability.  The built-in 16 chord melodious bell, including ding dong sound, alarm sound, dog bark, cry for help, bird cry, free choice. Suitable for different scenes, different styles, highlight the taste; Sound alarm sound up to 115 dB above.  The back with hole, can be hung on the wall, can also stand on the desktop.  The transmitter LED indicates the working status, the receiver has low power detection function, when the transmitter or receiver red LED flashing, it means the battery is fast power, prompt you to replace the battery.    Specification:  Material: ABS  Weight: 182g/6.4oz  WA - 10 (transmitter):  Power supply: 1* 12V 23A battery (Included)  Battery life: about 12 months (10 times/day)  White LED light on transmitting signal.  256 kinds of coding optional, double turntable design.  Transmitting signal method: press the button  Usage: indoor/outdoor (waterproof design for buttons)  Low temperature range of use: - 20 to + 45 ℃  Transmitter size: 70*45*20mm/2.8*1.8*0.8inch  WA - 100A (receiver):  Power supply: DC 4.5V, 3* AA batteries (NOT included)  Battery life: 3-6 months (10 times per day)  Battery low power prompt: red LED flashing  DC socket power supply: DC 4.5V, 200mA  Receiving frequency: 315MHz  Wireless remote control distance: outdoor open space distance up to 200 meters, indoor up to 100 meters (when the antenna opened.  Usage: indoor  Low temperature range of use: - 20 ℃ to + 45 ℃  Receiver size: 63*96*33mm/2.5*3.8*1.3inch