Honeywell RCWL300A1006 Premium Portable Wireless Doorbell / Door Chime and Push Button<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Wireless and operates on 3 LR6 AA alkaline batteries</li><li>Works with up to 3 push buttons， motion detectors， or door contacts for added security and convenience</li><li>Has three chime tunes， fully adjustable volume， and 3 visual alert icons</li><li>Self-learning code system automatically adjusts to eliminate interference</li><li>Features a 250-foot operating range</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41KLZW5msTL.jpg" noproxy>