Our wireless doorbells, featured with low-power consumption, energy-saving and environmentally-friendly. With 1000FT long operating range, 4 adjustable volumes and 52 melodies, plug receivers will remind you in time when someone visits your home and will never miss a visitor. One transmitter can pair to more than one receivers and one receiver can pair to more than one transmitters. Bring much convenience for your multiple rooms design house. Widely used in your home, apartment, office, warehous