Features: 1. Prevent accidents; 2. Extend the service life of the tire; 3. Prevent air leakage; 4. More fuel-efficient; 5. Reduce the wear of the suspension system; 6. Balance tire pressure to optimize performance; External sensor installation: When installing, screw the anti-theft nuts to the bottom of the valve, then tighten the external sensors. After the installation is complete, check for leaks. Specifications: Packing size: 170 x 120 x 45mm/6.69 x 4.72 x 1.77" Gross weight: 175g Sensor parameters: Operating voltage: 2.1V~3.6V Standby current: <0.7 uA Temperature measurement accuracy: ±4°C Operating temperature range: -20°C~60°C Pressure measuring range: 0-8 Bar Emission current: <8mA Waterproof rating: IPX67 Sensor weight: ≤10g Size: 20 x 16mm/0.79 x 0.63".