KEY SPECIFICATIONS & FEATURE: 1.The bellpush transmitter is powered by 3V CR2032 2.The Receiver plug in the mains. 120VAC 60Hz 3.Frequency 433.92MHz 4.Range up to (open air),Max 400 Ft meters 5.Additional bellpush transmitter or receiver is available 6.38different rings to be chosen 7.With LED flashing signal 8.Learning function 9.Transmitter water proof