1. Siren,108+/-3dB 2. 6tone(1tone optional) 3. Output power: 20W 4. Rated current: 850mA 5. Working voltage: 9-16V Siren, horn, speaker,car siren108+/-3dB6tone(1tone optional)Output power: 20WRated current: 850mAWorking voltage: 9-16V Car alarm Siren, horn, speaker,car siren SR78