High-quality sound (84 db); comes with 6 tunes</br>Range up to 250 feet</br>Connect up to 4 transmitters simultaneously, such as push button and awareness devices</br>Battery life up to 2 years</br>Portable or wall mount option (included)</br></br>Product Description</br></br>A wireless doorbell doesn't get any easier than this. No tools, no wires, no fuss - it's ready to use within minutes, offering you the freedom to go anywhere in your home without missing a visitor. Add impressive range, a choice of tunes, strobe and it's everything you need in a doorbell - Plus a little bit more.</br><br/>http://www.amazon.com/gp/product/B01HNSFT52