Voye 72-20488 Wireless Remote Control Doorbell With 10 Different Chimes Features include: Wireless design range is approximately 250-feet Choose from 10 different chimes can be set to high, medium and low volume settings easy to install Chime Dimensions: 3.8 (L) x 2.6 (H). Ringer Dimensions: 1.5 (L) x 2.75 (H). Ringer includes adhesive back for easy mounting transmitter requires one 12 volt battery (included) and chime requires 3 "aa" batteries (not included)