Physen Waterproof Wireless Doorbell，Operating Range at 1000 Feet，4 Adjustable Volume Levels with Over 50 Chimes，No Batteries Required for Main Receiver，White<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Expandable:PHYSEN Model B7 wireless doorbell is simple and stylish.2 remote push button and 4 plug-in receivers kit is very popular for department，large office，building of multifloor and etc.</li><li>Doorbell can work within 1000 feet in open area.Generally，it can work within 200-700 feet through the metal security doors and walls depending on the specific using environment</li><li>Remote push button is waterproof can accept for indoor or outdoor using environment，No matter is rain or snow weather</li><li>adjustable volume levels from 30dB to 110dB and over 50 different ring tones with backward button and forward button for you easily to select the favorite music</li><li>Easy install:just plug the receiver into outlet and use double-side adhesive tape at the back of the transmitter，also you can use the screw to install it.CE， FCC， RoHS certified</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41gLJYpPkCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51g9xpW59hL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51r0NmaycLL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/414V%2BYM6gjL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51tGb69tmvL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51D6SMOGPuL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/61SHz2D5-uL.jpg" noproxy>