Battery Operated Wireless Chime
Receiver Alarm: 60 songs with 4 levels of volume adjustable (0 dB - 110 dB); Transmitter Alarm: Light Only Transmitter Power Supply: CR2023 Battery (approx. half a year); Receiver Power Source: Outlet (AC110 V-230 V 50/60 Hz); Waterproof Level: Transmitter Waterproof level IP44 (if water gets in the transmitter groove will cause of the transmitter). 10 wireless range : 150 m (varies depending on building material and obstacles, usage environment, etc.)