Car tire pressure monitoring system for Android car DVD/navigation systems, real-time monitoring and display of tire pressure and tire temperature, if there is any abnormality, it will alarm in time to ensure driving safety. Specifications: Color: Black Material: ABS Sensor Type: External Sensor / Internal Sensor(optional) TPMS Receiver-- Working Voltage: 12 V Working Current: le;15mA Working Frequency: 433.92MHz Working Temperature: -20-80 Storage Temperature: -30-85 Interface: USB Item Size: 62 * 42 * 15mm/ 2.4 * 1.7 * 0.6in External Sensor-- Battery: 1 * CR1632(180mAh) Standby Current: lt;0.7 mu;A Temperature Measurement Accuracy: plusmn;4, -20-50 Working Temperature Range: -20-60 Pressure Measurement Range:0-8Bar Emission Current: lt;8mA Item Size: 20 * 20 * 16mm/ 0.8 * 0.8 * 0.6in Internal Sensor-- Battery: 1 * CR2050(350mAh) Standby Current: lt;0.7 mu;A Temperature Measurement Accuracy: plusmn;3, 0-70 Working Temperature Range: -40-125 Pressure Measurement Range:0-8Bar Emission Current: lt;10mA Item Size: 76 * 53mm/ 3.0 * 2.1in Package Size: 220 * 170 * 50mm/ 8.7 * 6.7 * 2.0in Package Weight: External Sensor: 200g/ 7.1oz Internal Sensor: 280g/ 9.9oz Packing List: 1 * Tire Pressure Monitor 4 * Sensor 1 * Wrench 4 * Nut 1 * User's Manual