Using TPMS, when the tire condition is dangerous, the driver can immediately receive an audio-visual alert,real-time monitoring of tire conditions，extend the tire life and ensure safe driving. (It is not recommended to install it on a trailer, as it may work abnormally. For trailers, please choose a device that supports a longer working distance, such as other devices with external antennas.) Specification: Receiver Voltage:5V Receiver Working temperature:-20℃- 80℃/ -4℉ - 176℉ Receiver RF transmits frequency: 433.92 MHz±50 KHz. Sensor Battery Life:2 Years, replaceable Sensor Working Temperature: -30℃- 80℃ / -22℉- 176℉ Sensor Voltage: 2.1-3.6V Pressure range: 1.5- 6.0 Bar / 22- 87Psiensor Pressure resolution: ±0.1 Bar / ±1.45 Psi Place on Windowshield or Center Console The tire pressure monitor can be placed on the windshield ,you don't need look down when driving, it doesn't block your vision and save space,which offer you a safer way to view on tire pressure monitor Important tips 1.It takes few minutes to sensor and display the tire's pressure and temperature after installation. The default high pressure alarm value is 44PSI (3bar) and the default low pressure alarm value is 29PIS (2bar). If the normal pressure value of the car tire exceeds this range, the display will sound an alarm, and changing the high and low pressure alarm values will solve the problem.