1 The sum settles the work electric voltage: 12V 2 Work electric voltage scope: 12V 3 Work electric current scope: 150-250 Ma (electric voltage is 12V) 4 Work temperature: -30+85 °C 5 The scope of the voice presses: 105±3DB 6 Power: Press to give or get an electric shock the whistle 7 Shape size: 132.2*72.8*43MM