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 pressure sensor is made of ABS+Copper material, impact resistance, heat resistance, low temperature resistance, chemical resistance, excellent electrical performance. 2. Bluetooth-compatible APP Tire Pressure Monitor: Connect mobile phone Bluetooth-compatible, monitor tire pressure, APP set high, low pressure and high temperature alarm values. 3. Data Display: The tire pressure monitoring system can display real-time tire pressure data, the tire pressure change is immediately known, and the tire pressure of four tires is checked at the same time. 4. Alarm System: The tire pressure monitor has a reliable alert system, it will alert you when something abnormal happens. The mobile phone will alert you when the tire pressure 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 issues, inquiries or need assistance, please feel to directly. Specification: Name: Car Bluetooth-compatible 5.0 Tire Pressure Monitoring System Material: ABS+Copper Colour: Black Specifications: 2 pieces, 4 pieces are optional. Master: SY36201 Communication name: BLE4.1 Bluetooth-compatible version: 5.0 Working voltage: 2.1-3.3V Display method: APP Waterproof grade: IP67 Tire pressure monitoring range: 0-100PSI (error less than 3psi) Bluetooth-compatible operating frequency: 2.4GHz Bluetooth-compatible transmit power: 4dBm MAX Response time: 4s Single sensor power supply: 140mAh (1 coin cell battery CR 1632 product includes battery) Battery life: 2-3 years Applicable: 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 Sensor 1 x Wrench 2/4 x Anti-theft screw 1 x Manual