2) 32 songs optional
3) Waterproof touch doorbell button
4) Doorbell, alarm, welcome alarm all in one
5) Learn 30 accessories (Doorbell transmitter, detector, remote control), without losing number upon power failure
6) Support accessories of 1527/2262 encoding
7) 4 levels adjustable volume
Waterproof touch doorbell button
F52 doorbell button waterproof level is up to IP66,you can put it on the outdoor wall .And low power consumption, it can use about one year if press average 10 times a day.
Easy to install
Just plug the receiver into power socket and attach the transmitter on door,you don't even necessarily have to make holes or damage anything.