Many accidents are caused by tire leaks on the highway. As a car owner, driving safely is a top priority. To reduce such accidents, a tire pressure monitoring system (TPMS) must be installed. With TPMS, keep the tires within the specified pressure and temperature range at any time to reduce tire damage and safe drive. Points: 1. Practical in Use: The tire pressure auto alarm sensor is suitable for APP compatible with Android DVD navigation. And alarm will be triggered when abnormal tire pressure appears. 2. Easy to Use: Just plug and play, the sensor set features easy installation. 3. Wide Application: The system is widely applicable to vehicles with 4 tires, such as commercial vehicles, off-road vehicles, minibuses and cars. Powerful TPMS: 1. Tire pressure monitoring system (TPMS) can monitor tire pressure and temperature status in real time. 2. Display tire pressure and temperature at the same time. 3. Leakage warning, low pressure warning, high pressure warning. 4. High temperature warning, low battery warning, no signal warning. : External sensor: Working pressure: 0-51 psi / 0-3.5 bar Pressure accuracy: +/- 1.5 psi Working frequency: 433.92MHz Working voltage: 2.0-3.6V Waterproof IP67 Working temperature: minus 40-85 degrees Celsius Storage temperature: minus 40-plus 125 degrees Battery: Built-in CR1632 120mAh button cell Colour: black Material: ABS Size: 14 * 15.8cm Package Contents: 1 * TPMS Receiver 5 * External Sensor 1 * Wrench 5 * Anti-theft Nut 1 * Instruction Manual 1 * USB Card Reader(Built-in APP) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.