Description: Flexible design, easy to install, no wiring required, money-saving and labor-saving, free moving installation position. Remote control range up to 100m in open air, meet the needs of residential and high-rise buildings. Build in anti-interference design, avoid the interference between users. Electric reduction voltage, making it safe. Mini size and beautiful appearance. Built in stereo speakers, especially suitable for office building, household, factories, tourism and other places, a wide range of uses. 32 turn songs for your selection. Battery LED indicator, easy for you to know when to replace the battery, widely used, not only as an ordinary doorbell, it can be used for special purposes, such as liaison, paging, patient care, emergency notification, etc.. Included: 1 X Transmitter(Remote Control) 1 X Receiver(Chime)