Detailed description:Chip: InfineonMaterial: ABSCharge upper limit voltage: DC 5VWorking current: Le than 15mAPower supply: Solar or USB poweredBattery capacity: 1000mAhConnecting method: WireleWorking frequency: 433.92MHz1.00MHZTemp setting range: 60~110Tire preure setting range: 0-4barWorking temp: -20~80Storage temp: -30~85Item size: 8 *7.3* 1.5cm/ 3.15* 2.87* 0.59in Parts List:1 * Tire Preure Monitor 4 * External Sensor 1 * Charging cable 1 * Spanner 4 * Anti Theft Bolt 1 * Double-sided Tape 1 * User Manual Highlight description:Multiple Alarm ModesIt supports multiple alarm modes such as slow tire leak, fast tire leak, high preure, high temperature, sensor's low power, sensor's failure, and other alarms, real-time monitoring of tire conditions to ensure you a safe trip.Visible & Audible AlertsIt owns a large color display screen, showing tire preure, current temp and date, more visually when driving. Besides, it also poees a buzzer to remind you when you have to pay more attention to the road.Solar & USB ChargingPowered by solar when it's sunny to use one more USB port of car charger while powered by USB interface when rainy. Accompany you no matter how bad the weather is.IPX7 WaterproofWater jet resistant, and it can still work without influence even through the rain screens, splashing water, parking lot water.Real-Time Detection Adopt advanced profeional technology to ensure stable signal, accurate data, and instant response, sending alarm instantly when tire preure is abnormal.Great GiftSimple and Wirele installation, a perfect gift idea for family, relatives, or friends to guard them along the long-distance journey.