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General Description: This DIY external TPMS sensor kit is wireless with an easy screw-on design, allowing installation in minutes. Each tire valve cap contains a sensor that sends individual real-time pressure readings to a receiver that plugs into a standard 12V power outlet. It is suitable for vehicles without factory TPMS and helps monitor tire pressure and temperature, preventing flat tires and punctures. The receiver features visual and audible alarms for fast/slow leakage, high temperature, and low battery, and includes a 5V/1A USB port for charging other devices. Technical Specifications: External Sensor Specifications: Operating Frequency: 433.92 (+/- 0.5MHz) Sensor Battery Voltage: 3V Operating Temperature: -20°C to +60°C Pressure range: 0 to 75 psi (0 to 4.8 Bar) Operating range (sensor-to-display): 502.92 cm (vehicle dependent) Each sensor measures: 2.29 cm diameter x 1.52 cm high (0.01 kg) Receiver Display & Technical Specifications: Monitoring pressure range: 10 to 75 psi (0.7 to 4.8 Bar) User-adjustable alert threshold range: 18 to 66 psi (1.2 to 4.5 Bar) Multiple pressure (psi/Bar) and temperature (°F/°C) measuring units Operating Frequency: 433.92 (+/- 0.5MHz) Operating Voltage: 12V (+/- 3V) Operating Temperature: -40°C to +70°C USB Port: 5V/1A Number of Sensors: 4 Display Compatibility: Cigarette Lighter Mounted Display Alert Style: Audio And Visual Alerts Installation Guide: Remove your vehicle's standard tire valve caps. Slide the dust cover around the tire valve. Thread on the locking security nut. Once the dust cover and locking nut are in place, thread on the valve cap sensor. Do not over-tighten the sensor to avoid stripping the threads on the tire's valve. Stop threading the sensor when you no longer hear air escaping the tire. Tighten the locking security nut with the included tools to prevent theft of the sensor caps. Repeat this process for the remaining tires. Sensor batteries are included. Note: TPMS systems are not suitable for use with liquid tire sealants. Each sensor is marked to indicate which tire to install it on, so the corresponding tire pressure is properly displayed on the receiver's screen.