Feature 1 SELF POWERED DESIGN: Built in power generation template, when use the finger to press the button, automatically converted into electrical energy, instantly send out wireless signals, indoor receiver automatically ring. 2 WIRING FREE INSTALLATION: Self powered doorbell set, no battery for life, no wiring, punch free. Plug the receiver into the indoor power supply, then stick the Dingtone doorbell to the doorway or other location where it is to be installed. 3 LOUD SPEAKER: The doorbell is equipped with audio grade loud speaker, and the ringtone covers 200m. No more worrying about the awkward scene of a dead doorbell when a friend comes over. 4 WIDE APPLICATION: An excellent wireless doorbell set, easy to install, perfectly suitable for home, office buildings, apartment, school, villa, warehouse, hotel, factory, hospital or others. 5 HIGH PERFORMANCE: Unique plug in doorbell kit, small and exquisite, with large ringing, can be used as a pager for the elderly. A good choice for wireless doorbell for home and any other occasion.Item Type: Self Powered DoorbellMaterial: ABSColor: WhiteWeight: Approx. 111g / 3.9oz Package List1 x Doorbell1 x Receiver1 x Back Adhesive1 x English Manual