1. Material: ABS, PC 2. Voltage: 12/24/220V 3. Working method: whistle 4. Degree of protection: IP54 5. Volume: 120dB 6. Power: 1W 7. Installation method: wall-mounted installation 8. High decibel transmission, clear and bright sound 9. Waterproof and dustproof design, can be used outdoors in rainy days 10. Size: about 6.2x4.7 cm/piece 11. Alarm principle: power-on alarm, warning by sound
