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 ( , 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 and iOS, requires Bluetooth 5.0 .Product name: TPMS Bluetooth Tire Pressure MonitorProduct style: external sensorProduct specifications: 4 roundsDetection range: 0-8.0 BarWorking voltage: 3VWorking current: 100ABluetooth operating frequency: 2.4GHzBluetooth transmit : 0dBm MAXWaiting time: less than equal 5sDisplay mode: mobile APPWaterproof rating: IP67Working humidity: up to 95%Tire pressure detection range: 100-1300kPaTire pressure detection accuracy: 10kPaTire temperature detection accuracy: 3 CelsiusProduct battery: replaceable 140mAh CR1632 (external sensor)Battery life: 3~5 years (external sensor)Colour:blackMaterial:ABS plasticPackage Contents:4 x Sensors4 x Screws1 x Wrench1 x English manualOnly 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.