1. Working voltage: 10.5-15V 2. Working temperature: -20-65 3. Power consumption: 200mA(max) 4. Alarm distance: 1.5m-0.0m 5. Detective distance: 2m 6. Buzzer volume: 83dm 7. Maximum detection error: 0.05m 8. Front probe detection distance: Side 0.8m middle 1.0m 9. Back probe detection distance: Side 1.0m middle 2.0m 10. Speaker report distance: 1.5m, 1.2m, 1.0m, 0.8m,