Warning: Product displays by cellphone. During driving, please be careful when viewing tire pressure and temperature in cellphone. If tire pressure accelerates down or up continuously, please parking and check if there"'"s any problem with the tire. This product can read tire pressure and temperature, but it cannot avoid sudden accident caused by tire.It"'"s important to use. Tire with high quality. Slightly tire leakage makes tire pressure decreases over time is normal. It has nothing to do with this product installation. Specification : Material: ABS, Copper Bluetooth Version: Bluetooth 5.0 Working Voltage: 2.1-3.3V Quiescent Current: 1 uA Bluetooth Operating Frequency: 2.4GHz Bluetooth Transmit Power: 4dB Response Time: 4s Display Method: APP Waterproof Grade: IP67 Working Humidity: 95% MAX Tire Pressure Monitoring Range: 0-100PSI Tire Pressure Monitoring Error: +3PSI Working Temperature: -30~70 Storage Temperature: -30~70 Battery Life: 2-3 Years Battery Capacity: 140mAh (External) Sensor Size: 22*18mm Number Of Sensors: 2PCS/3PCS/4PCS (Optional) Alarm Function: High Pressure, Low Pressure, High Temperature Suitable For: Car, Motorcycle, SUV, MPV, RV, ATV Feature: Dynamically monitor tire pressure on 4 wheels at same time, prevent damage from flat tire, Improve fuel efficiency, prolong tire life span, ensure driving safety. It was designed as a direct tire pressure monitoring system, installing pressure and temperature sensor on the tire, then displaying the real-time data on phone (Android , IOS, IPad) through Bluetooth connection, During travel, tire pressure and temperature displayed in real time and send alert when statistics"'" abnormal. For your safety. TPMS supports both Android4.0 and above; supports IOS7.0 and above, requires Bluetooth 5.0 or above. APP Download And Installation Method: System requirements: support Android 4.0 and above systems or lOS7.0 and above systems; Search the APP name in the App Store to download and install (name: SYTPMS or TPMS); For Android phones, please scan the QR code to install directly. Note: If the date of sensor cannot be get , pls re-install the sensor. (please install slowly to make the air pressure fully contact the sensor) Household products, not for commercial use. Stop using the machine immediately if the motor heats up. Use for 1-2 hours at most each time. Package Included: 4 x Externer Sensor 4 x Screw 1 x Wrench 1 x User Manual Do drop