Honeywell RCWL3503A1000/N Decor Wireless Doorbell / Door Chime and Push Button<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Wireless - Battery operated</li><li>Works with up to six (6) push buttons， motion detectors or door contacts for added security and convenience</li><li>Six (6) chime tunes and fully adjustable volume</li><li>Self learning code system automatically adjusts to eliminate interference</li><li>450-ft operating range</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41gAHsKXvGL.jpg" noproxy>