SNAN Tire Pressure Monitoring System, Wireless TPMS with Alarm Function and USB Interface, Tire Pressure and Temperature Gauge with 4 External Sensors Wireless TPMS Cigarette Lighter Plug, Provides 4 tires Real-time Pressure or Temperature Simultaneously, and provide visual warning light and audible alarm sound immediately when tires pressure or temperature thresholds are exceeded. The pressure and temperature alert values can be adjustable (default 29-44PSI/2.0-3.0Bar), with pressure unit: PSI/Bar selectable and temperature unit: C Tire pressure sensors are designed with anti-theft, waterproof, and easy installation, includes special tools for installation and replace the sensor battery (CR1632). Tire pressure sensor is only 9 grams and the battery life can last up to 2 years, the battery (CR1632) can be replaced when the battery exhausted. Universal TPMS for 4-wheel car, not suitable for motorhome, caravan or trailers. 4 sensors have been coded to the display, just install the sensors as per the position labels on the sensor (RR, RF, LF, LR), a replacement sensor can be easily coded; just simply mount the sensor onto the valve when the display is in coding mode. WARRANTY - We provide 18 MONTHS guarantee, we will give you refund or send you replacement if you are not satisfied with our product.