Physen B7 wireless doorbell kits built well, and it has a nice minimalist style.You can DIY your house and program each push button to a different tone so you can know which door is ringing.
Doorbell can work within 900 feet in open area.Generally,it can work within 200-700 feet through the metal security doors and walls depending on te specific using environment.
IP55 Waterproof Transmitter:can use in indoor or outdoor and at the bottom allowing you to leave a message when you are not at home
4 adjustable volume levels from 30dB to 110dB[much louder],52 charming melodies is available and choose your favorite music directly by pressing forward/back button[more choose]
Easy Installation:Just plug-in the receiver in electrical outlet and use double-side adhesive tape at the back of the transmitter,also you can use the screw to install it.CE, FCC, RoHS certified