беспроводной дверной звонок

Wireless Door Bell 1.wireless Door BellwithDC poweroperated . 3.East to install ,wire free. 4.The distance up to 100 meters with music up to 36 tunes. 5.Different painting available. 6.PCB manufacturing by SMT machine which ensure a stable quality. 7.Auto match code function enablebuilds unique connection between receiver and buttons which block interference from outside signal. 8.Power saving design with batteries of both receiver and transmitter can be used for 12 months. 9.Volume adjustable:low or high. 10.Indication light with LED lighting. 11.Three patterns available: Ring only,light flash only or combination of Ring and light Flash