Power supply method: Self-generating

Size: 77×45×16mm

Indoor and outdoor transmission distance: ≤100 meters (unobstructed environment)

Operating temperature: -10°C～45°C

Protection performance: Waterproof and dustproof

Voltage: 5V (USB port power supply)

Power consumption: ≤0.25W

Operating temperature: -10°C～45°C

Controllable volume: ≥50dB/m

Size: 43×41×35mm

Volume adjustment: Three levels

Ringtones: 38 kinds

Installation and use: No wiring required, plug and play