Specification The Main Unit: Voltage: 10-16V Operating Current: <50mA Operating Temperature: -20~+85°C Operation Condition Humidity: <90% Weight: 93g Dimension: 122mm?18mm?38mm Temperature Accuracy: ±2°C Dimension：75mm?32mm?16mm The Extension Units: Voltage: built-in durable Lithium Ion battery Operation Temperature: -40~+125°C Operation Condition Humidity: <90% Emission Frequency: 433.92MHz Pressure Range: 0-6kg/cm2 Pressure Accuracy: 5%