Brand Name : Luckarm Material: ABS plastic Power: Receiver 4.5v sender:1*23A Color: Black white Type: Wireless digital doorbell Working frequency of 315 MHz / 434MHz 1) Suitable for homes, office installed in or outdoors buildings and home etc. 2) Twenty-five polyphonic... Brand Name : Luckarm Material: ABS plastic Power: Receiver 4.5v sender:1*23A Color: Black white Type: Wireless digital doorbell Working frequency of 315 MHz / 434MHz 1) Suitable for homes, office installed in or outdoors buildings and home etc. 2) Twenty-five polyphonic melodies for option 3) Transmitter uses 1x12V 23A battery (supplied) 4) 100m operating range 5) Easy to install, Wall Mounted 6) No electrical wires to install,Waterproof design 7) Suitable for Hard of Hearing with Strobe feature 8) Low power consumption 9) CE certificate 10) Battery inside the button can last for 1 year(20 presses per day) Remote Controller: DC 12V 23A battery (included)