Wireless Waterproof Door Bell Kit, Distinguishes Front and Rear Doors, 300m+ Range and 60 Melodies, 5-Level Volume and LED Flash, for Home, Office, Classroom

Distinguish between front and back doors: you can program each button with a different tone so you know where your guests are. This is a very handy feature for multiple inputs.
Longest range: up to 1,000 feet (300 m) outside the transmitter (500 feet [150 m] if there are walls). Whether you are busy in the bedroom or in the kitchen, our wireless doorbell kit can remind you that someone is calling from outside. Don't you Never worry about not seeing visitors.
IP44 Waterproof: The doorbell button is IP44 rated and weatherproof for outdoor use. The doorbell is suitable for any home, townhouse, apartment, office, school, hospital, hotel or other application.
60 melodies and 5 adjustable volume levels: the wireless doorbell offers a wide selection of 60 melodies to choose from. 45 level volume range from 0 dB to 110 dB.
Expandable and easy installation : Expand your existing doorbell system with up to 8 unlimited transmitters and receivers. Simply plug the main doorbell into a wall outlet, install the push button with the included double-sided tape or screws.