KUCAM Portable Wireless Doorbell Kit, 36 Chime Tones Operating at 1000ft/ 300m Range, IP44 Waterproof 1 Push Button (Battery Transmitter) with 1 Plug-In Door Chime (AC Receiver) Looks very nice and is easily recognizable as a door bell with a blue ring button 36 Rings Tones to choose from,4 levels volume adjustable (25db to 85db),it's loud enough for you to hear when you are upstairs or in backyard, 500-foot cover range (1000 feet in open area) Quick and easy to use, the unit comes with battery, stick pad and screws set, you can use stick pad or screws to fix the push button, the inside receiver ringer is compact and you can place it wherever you have an electric outlet. The Push button is IP44 waterproof, you can place it outside the door for normal daily use. Flashing led light with sound rings on receiver, makes it convenient to know doorell ringing when any guests press the button outside. Digital radio signal paired between each receiver/transmitter set, no interference by nearby wireless doorbell signals