Features 1. Dual power charging: Our tire pressure monitoring system can be charged through USB and solar power, providing you with a reliable power supply option. With efficient solar panels and built-in lithium batteries, you don't have to worry about replacing the battery or running out of power. 2. 6 alarm modes: Our system provides 6 alarm modes to keep you informed of any potential tire issues, including fast and slow leak alarms, high and high pressure alarms, sensor failure alarms, and low battery alarms. You can use it in any environment, with a wide operating temperature range of -20 to 70 degrees Celsius (-4 to 158 degrees Fahrenheit). 3. Clear LCD display: The color LCD screen displays real-time pressure and temperature readings, allowing you to easily switch between PSI/Bar and C/F units. No matter where you install it, you can clearly read the data and keep track of your driving condition at any time. 4. Intelligent sensors: Our system is equipped with 4 external sensors, which are easy to install and can provide stable and persistent signals. The sensor is powered by 4 batteries and can receive signals from a distance, bringing you more convenience and peace of mind. 5. Wide compatibility: Our TPMS is suitable for tire pressure ranges of 0-3.5Bar/0-51psi, making it ideal for use in various vehicles, including cars, RV trailers, trucks, and more. With its multifunctional design and easy installation, it is a must-have for any driver who wishes to improve road safety and performance. Product specifications Display screen LCD Pressure setting range: 0~50psi/0~3.58ar Temperature setting range: 60 ℃~110 ℃/140 º F~230 º F Working temperature -20 ℃~80 ℃/-68 º F~176 º F Storage temperature -30 ℃~85 ℃/86 º F~185 º F Power on voltage DC 5V Frequency 433.92MHz ± 20.00MHz Transmission mode FSK Pressure unit BAR/PSI Charging method: solar energy/USB Specification Material: ABS Color: Black Size: 13 x 16 x 4 cm Weight: 200 g Package Include: 1 x TPMS receiving host 4 x sensors 4 x anti loss nuts 1 x hex wrench 1 x Anti slip pad 1 x User Manual