ACO NEST WIRELESS SQUARE PLUG-IN DOORBELL WITH KINETIC BELL PUSH

Operating range up to 100 metres on open air. 
Bell push with waterproof IP44 and LED indictor. 
32 sounds selectable on chime,4 level volume adjustable. 
Self-learning function avoid any interference
Receiver is powered by 220V with US plug,bell push button is selfpower, no need battery.