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The transmitter in this doorbell does not use mains power or battery; instead, the electricity needed to send a radio signal to the receiver is made by simply pushing the button and utilizing kinetic energy. The receiver is powered by a 500 mAh USB adapter, so the yearly electricity costs for the receiver are much lower than the standard converter of a normal electrical doorbell and saves energy and batteries at the same time. Features 38 different ringtones. Includes USB powered receiver AC USB charging adapter included) and installation materials. 100-metre operating range in open field. LED indication on receiver. Volume adjustable. Frequency: 433 MHz.