Operating range up to 100 meters in the open area
Code of receiver and transmitter could be adjusted avoid the code crossover with the similar equipments in your neighborhood.
16 pieces of music could be optional.
Transmitter use one 12V 23A battery.
Receiver use 3*AAA battery
Receiver (bell)size: 118*78*26(mm)
Button (transmitter)size: 78*39*23(mm)
IP44
Patented: CE, R&TTE, ROHS