AVANTEK Wireless Doorbell over 1300 Feet Wireless Range, DB-21 Waterproof Door Bell Kit with 2 Buttons, 56 Melodies & 5 Volume Levels

1300 FT/ 400 M 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
EASY TO SET UP: 2 transmitters included; can add more AVANTEK RB-1 and CR-1 receivers for increased coverage; simply fix the transmitter on the wall without any wiring; includes 4 screws, 4 anchors, 1 key and 2 double-sided adhesive pads
TAILOR YOUR TRANSMITTER: 40 mm stereo speaker delivers rich and crisp sound; 52 melodies and 5 adjustable volume levels with a maximum setting of 115 dB; set a different ring tone for each transmitter so that you know exactly which doorbell has been rung
HIGH PERFORMANCE: The transmitter has ultra-low power consumption; uses a 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 a power outage; no need to reset to your previous settings; convenient and easy-to-use design for an enhanced user experience