This modern looking ultra high-end wireless doorbell by Jacob Jensen offers a sleek, award-winning design and features five different specially composed, high quality polyphonic tunes including a special tune designed for the hard-of-hearing. Select from several sounds including a classic town hall bell, knocking at an old wooden door, Contemporary lounge-inspired tune, Asian-inspired tune, or a low-frequency tune designed for the hearing impaired. Tunes can be assigned to individual bell pushes to identify which doorbell is ringing. One bell push and one door chime receiver unit is included with the wireless doorbell set but an unlimited number of bell pushes and door chime receivers can be purchased separately and added to your configuration. The long range chime unit of the wireless doorbell can be free standing or wall mounted with the included hardware. The doorbell push can be mounted with included screws or double-sided tape. Batteries are included and last up to two years. Alternatively a plug-in adaptor can be connected to power the chime. A small illuminating light on both units indicates a ring as well as a low battery level. Volume is adjustable- low, high, or off. A specially designed coding system ensures there is no interference to or from any nearby wireless products. This wireless door chime will not disappoint!