Say goodbye to wires and batteries when installing or upgrading your doorbell system with the Lotus LED Lights wireless kinetic doorbell. These innovative door bells require no power source, instead utilizing the kinetic energy created by pushing the doorbell to alert the receiver. Each transmitter comes with included plug-in receiver (that can be paired up to 100 feet away) and can be paired with up to 100 receivers for multiple points of notification around the building they are installed in. Choose up to 28 ring tone melodies with 4 volumes. A flashing light on the receiver adds an extra layer of notification as well.