Starsea Customizable Wireless Doorbell Kits No Battery Required for both Transmitter and Receiver， Waterproof Push Button， 8-Level Volume and LED Flash， Pre-customized 16 Ring Tunes<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Downloadable MP3， pre customized 16 ring tunes， 2M/2048K free customized memory</li><li>PUSH-RF technology， lifetime 200000+ times， no battery required for transmitter and receiver</li><li>High quality sound and LED flash， 8 levels of adjustable volume from 0db to 115db</li><li>433 MHz wireless transmission technology， 600-ft operating range</li><li>IP47 Waterproof transmitter， easy to install</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41pD-6g-wfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31Ei47zZgcL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31eA9qHPAPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41fMudO3QLL.jpg" noproxy>