NOTE: The battery-operated doorbell kits only pair with our battery-operated doorbell kits (Model number: BA-11/WA-11), and they do not match other kits or accessories in our store. CONVENIENT BATTERY-POWERED RECEIVER: This battery-operated doorbell is powered by 3 AAA batteries (included) so no electric outlet needs to be occupied; simply screw the mounting bracket onto the wall and then hook the receiver on (Receiver: 1.2" x 1.1" x 0.4", Transmitter: 1.2" x 0.6" x 0.2"? 300 M/1000 FT ULTRA LONG WIRELESS RANGE: Will not interfere with other equipment in your home or those of your neighbors; ensures you will never miss a visitor, even if you are a few rooms away or on another floor 52 CHIMES TO CHOOSE FROM: 29 mm stereo speaker delivers rich and crisp sound; 5 adjustable volume levels with a maximum setting of 120 dB; press Next or Previous button to easily choose from 52 melodies HIGH PERFORMANCE TRANSMITTER: Ultra-low power consumption; uses CR2032 lithium battery that boasts 3-year maximum lifespan; IP55 dustproof and waterproof rating; works between -4 F to 140 F; withstands various harsh weather conditions MEMORY FUNCTION: Remembers your last melody and volume level after the battery replacement; no need to reset to your previous settings; convenient and easy-to-use design for an enhanced user experience