AVANTEK Wireless Doorbell, 1300 ft Long Range Door Chime Kit, IP55 Waterproof, 52 Melodies, Up to 115dB Volume and LED Flash with 2 Plug-in Receivers & 1 Push Button, Black

ULTRA-LONG WIRELESS RANGE: 2 plug-in receivers included, the sensing distance can reach up to 400 M/1,312-FT in unobstructed environment; will not interfere with other equipment in your home or those of your neighbors, ensures that you will never miss any visitors
HIGH PERFORMANCE TRANSMITTER: Ultra-low power consumption; uses a lithium battery that boasts 3 year maximum lifespan; IP55 dustproof and waterproof; working temperature ranges from -4 °F-140 °F; withstands various harsh weather conditions
52 BEAUTIFUL CHIMES: 40 mm stereo speaker delivers rich and crisp sound; press the Next or Previous button to easily choose from 52 melodies; 5 adjustable volume levels, with a maximum volume of 115 dB; enjoy pleasant melodies whenever someone rings at your door
Expandable Doorbell System : Expand your existing doorbell system with up to 2 transmitters and unlimited receivers, build your own simple alert system
MEMORY FUNCTION: Preserves your last set melody and volume level after a power outage; no need to reset to your previous settings; convenient and easy to use design for a better user experience