Latest development in power supply:
Indoor unit: AC100V ~ 240V 50 / 60Hz
Outdoor unit: No separate power supply is required, when the button is pressed, it generates kinetic energy, so it sends the signal to the indoor unit.
40 meters indoors,
150 meters outdoors.
You can choose from 60 kind of ringtones to use at a volume between 25 to 85 dB.
Water resistance (outdoor unit):
The protection level IP44 is resistant to any weather.