Correct connect step Step 1. Open Bluetooth-compatible and Location on your phone Step 2. Open "sytpms" App NOTE: if your phone Bluetooth-compatible or Location closed, when you running "sytpms" App first, and than open Bluetooth-compatible or Location , the App will connect fail, Please del "sytpms" running record, and use correct connect step. Feature:1. High Quality:The tyre preure sensor is made of ABS+Copper material, impact resistance, heat resistance, low temperature resistance, chemical resistance, excellent electrical performance.2. Bluetooth-compatible APP Tire Preure Monitor:Connect mobile phone Bluetooth-compatible, monitor tire preure, APP set high, low preure and high temperature alarm values.3. Data Display:The tire preure monitoring system can display real-time tire preure data, the tire preure change is immediately known, and the tire preure of four tires is checked at the same time.4. Alarm System:The tire preure monitor has a reliable alert system, it will alert you when something abnormal happens. The mobile phone will alert you when the tire preure is too high or too low, and alert you when there is an air leak.5. Satisfaction Guarantee:We strive to provide each customer with the highest standard of customer service to ensure you have a pleasant shopping experience. If you have any iues, inquiries or need aistance, please feel free to contact us directly.Specification:Name: Car Bluetooth-compatible 5.0 Tire Preure Monitoring SystemMaterial: ABS+CopperColour: BlackSpecifications: 2 pieces, 4 pieces are optional.Master: SY36201Communication name: BLE4.1Bluetooth-compatible version: 5.0Working voltage: 2.1-3.3VDisplay method: APPWaterproof grade: IP67Tire preure monitoring range: 0-100PSI (error le than 3psi)Bluetooth-compatible operating frequency: 2.4GHzBluetooth-compatible transmit power: 4dBm MAXResponse time: 4sSingle sensor power supply: 140mAh (1 coin cell battery CR 1632 product includes battery)Battery life: 2-3 yearsApplicable: 4 wheel cars and 2 wheel motorcycles.Note:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!Please allow 1-2cm measuring deviation due to manual measurement. 2/4 x Sensor1 x Wrench2/4 x Anti-theft screw1 x Manual