4pcs 2.5 Bar Car Tire Preure Guage Cap Sensor Indicator Alert Monitoring Tool Tyre Cap Indicator Alert Air Preure Gauge Features: 1. Easy to understand, easier to read than the tire preure gauge, real-time monitoring at a glance, three colour warning to save your mind. 2. Pure bra material, this tire preure monitoring cap whether shell or core are all made of bra, pure copper core will not be deformed when the tyre temperature is too high. 3. The transparent cover of the product is made of PC material, which is strong and durable and easy to observe. 4. Usually, the air is pumped into the car according to the standard of 2.5 bar, this tire preure cap can be used completely. A 15% drop in preure in one tyre will increase your car's fuel consumption by 6% and double the wear and tear on your tyres, thus increasing the risk by 30%. The tyre preure cap will remind you of this. Instructions for use: 1. Normal: In the case of standard tyre preure, the transparent window should be green and the vehicle is running normally. 2. Warning: If the tyre preure is slightly below the standard by about 10%, the transparent window should be yellow-green and the vehicle should be inflated in time. 3. Danger: If the tyre preure is below the standard by about 25%, the transparent window should be yellowish red and the vehicle should be checked and inflated immediately. Note: Please make sure that the "tyre preure cap" is tight and check that the colour circle is at the normal value when installing. Procedure: 1. Unscrew the existing valve cap 2. Adjust the tyre preure to the manufacturer's recommended range. (tyres must be cold) 3. Screw the indicator cap onto the tyre valve by hand 4. Check the indicator cap regularly 5. If the green colour drops to show red, the tyre preure is insufficient 6. Inflate the tyres to the correct preure 7. Keep the valve cover clean and easy to check Specification: Material: stainle steel + gla Size: 2.2*1cm Weight: 32g (including packaging) Suitable for models: Universal Package included: 4*Tire preure caps Note: 1. Due to manual measurement, please allow 1-3mm error. Please make sure you don't mind before ordering. 2. Please allow 1-3g weight error. Please make sure you don't mind before ordering. 3. Due to different lighting in the photos and differences in monitors, the pictures may not reflect the actual colour of the object. Please make sure you don't mind before ordering, thank you!