Wireless Solar Powered: No batteries or wires required, this tire temperature monitor is solar powered, environmentally friendly and easy to use. External timing car universal tire detection monitoring: This tire pressure alarm can detect tire pressure and temperature from outside the car, providing accurate and reliable monitoring. 5V Voltage: This tire pressure alarm operates at 5V, compatible with most cars, and can be easily installed without any complicated wiring. Alarm system and safety: This tire pressure alarm can not only be used to monitor tire pressure, but also serves as an alarm system for your car, ensuring greater safety. [Solar and USB Charging]: 2 charging methods that the tire pressure monitoring system works continuously and does not occupy the car's lighter socket. [Digital LCD Display]: The display shows real-time pressure and temperature, which can be placed anywhere stably and you can read the data easily. [Easy to Use]: 4 wireless external sensors, easy installation, real-time signal reception. Working frequency: 433.92MHz Working voltage: 3.7-5V USB charging current: 250ma Sleep current: 4ma Product weight: 220 grams Long-term storage temperature: -30~+90 Working current: 6ma Working environment: -30~+85 Monitoring temperature range: -40~+130 Monitoring pressure range: 0-3.5Bar Colour:Black Material:plastic Package Contents: 1 x Tire Temperature Monitor Only the above package content, other products are not included. Note: Light reflection 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.