Operating voltage: 4. 0 ~ 30V Operating Current: <60mA Display: 0.56 "LED, Measurement rate: ≥ 500mS Measurement accuracy: 1% Maximum operating conditions: Minimum operating voltage: +4. 0 V Maximum operating voltage: +30 V Operating temperature: -10 to +65 °C Operating Humidity: 10 ~ 80% (no condensation) Working pressure: 80 ~ 106kPa Sun exposure: no direct exposure Notice: This form is not suitable for 24 V truck, because the truck battery electric voltage will be enough in 28 V or more, especially the truck after its launch moment will have a great pulse disturbance may be damage to the module