Keychain Mini Tire Pressure Gauge product features: 1. Pressure range: 3-150psi 2. Four pressure options: kg/cm2, kPa, psi, bar 3.LCD digital display 4. Long-lasting lithium battery power supply 5. High accuracy: accuracy ±1% 6. Resolution: 0.01kg/cm2, 1kPa, 0.1psi, 0.01bar 7. Size 6.3*3.3*1.5cm 8. Automatic shutdown, power saving mode Four major benefits of the product 1 can accurately measure the pressure of car tires 2. Effectively prevent tire blowouts to ensure safe exercise 3. Reduce fuel 4. Extend the service life of tires