Wireless Doorbell， KSANA Long Distance Waterproof Wireless Doorbell - 4 gear volume adjustment，36 Ringtones，1 Plug-In Receiver and 1 Push Button Transmitter<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Wide range: working rang is 500 feet wide and 1000 feet wide in the open area.</li><li>Ringtone: 36 different ringtones are available， and the volume can be adjusted (20 dB -90 dB)</li><li>Easy Installation: No batteries and wire required for main receiver， just plug the receiver into an electrical outlet. Push button can be fixed to the doorframe with the attached adhesive tapes</li><li>Package Contents: 1 plug-in receiver， 1 remote transmitter， double side sticker， 23A 12V alkaline battery for remote transmitter， a battery cover opener and user manual.</li><li>dedicated to 100% customer satisfaction， and we ensure 1 year money back with any reason under any condition， 1 year manufacturer warranty for material and workmanship. So no worry about this item and try it right now.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41wa%2B2k3ojL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41OS-CszjNL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Zi-KSGQyL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41vzuO8qW8L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41MOGxuLb-L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51F54lHtfHL.jpg" noproxy>