1.Dynamically monitor tire pressure on 4 wheels at same time,prevent damage from flat tire,Improve fuel efficiency, prolong tire life span, driving safety. 2.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, ) through Bluetooth connection, 3.During travel, tire pressure and temperature displayed in real time and send alert when statistics' abnormal. For your safety. 4.TPMS supports both Android and iOS, requires Bluetooth 5.0 . Product name: TPMS Bluetooth Tire Pressure Monitor Product style: external sensor Product specifications: 4 rounds Detection range: 0-8.0 Bar Working voltage: 3V Working current: 100A Bluetooth operating frequency: 2.4GHz Bluetooth transmit power: 0dBm MAX Waiting time: less than equal 5s Display mode: mobile APP Waterproof rating: IP67 Working humidity: up to 95% Tire pressure detection range: 100-1300kPa Tire pressure detection accuracy: 10kPa Tire temperature detection accuracy: 3 Celsius Product battery: replaceable 140mAh CR1632 (external sensor) Battery life: 3~5 years (external sensor) Colour:black Material:ABS plastic Package Contents: 4 x Sensors 4 x Screws 1 x Wrench 1 x English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. SZRH A-B