-Bluetooth 4.0 TPMS Description-1.Dynamically monitor tire preure on 4 wheels at same time,prevent damage from flat tire,Improve fuel efficiency, prolong tire life span, ensure driving safety.2.It was designed as a direct tire preure monitoring system,installing preure and temperature sensor on the tire,then displaying the real-time data on phone (Android , IOS, IPad) through Bluetooth connection,3.During travel, tire preure and temperature displayed in real time and send alert when statistics' abnormal.For your safety.4.TPMS supports both Android and iOS, requiresBluetooth 4.0 or above.-External Type-Sensor Specifications:Proceor:ARM M0Working Voltage :3VWorking Current:100AStandby Current:2.2ABluetooth Working Frequency:2.4GHzBluetooth Transmitting Power:0dBm MAXWaiting Time:5sDisplay:Phone APPWaterproof Standard:IP67Working Humidity:95% MAXTire Preure Detection Range:100-1300kPaTire Preure Detection Accuracy:10kPaTire Temperature Detection Accuracy:3Working Temperature :-30--80(Outer Sensor)Working Temperature:-40--85(Inner Sensor)Storage Temperature:-30--+85Outer SensorStorage Temperature:-45--125Inner SensorBattery Capacity:140mAh(Outer Sensor)Battery Capacity:330mAh(Inner Sensor)Battery Life:2-3Years(Outer Sensor)Battery Life:3-5Years(Inner Sensor)Sensor Weight:10g1g (Outer Sensor)Sensor Weight:33g1g(Inner Sensor)-Question And Answer-C:Could you please tell if battery is changeble for the sensor?Seller:Yes,it could.C:Can change the sensor position ?Seller:Yes,it can.-APP Description-Compatible Operating System:TMPS Support Both Android And IOS,Requires Bluetooth 4.0 or above-APP Installation-Option 1: Scan QR code on card, then download and install;Option 2: Search BEL TPMS in APP Store or Google play Store, then download and install. -TPMS Maunal And APP Display- 1: Support cellphone with Bluetooth 4.0 or above. DO NOT support Cellphone with Bluetooth lower than 4.0.2: Product displays by cellphone. During driving, please be careful when viewing tire preure and temperature in cellphone.3: If tire preure accelerates down or up continuously, please parking and check if there's any problem with the tire.This product can read tire preure and temperature, but it cannot avoid sudden accident caused by tire.It's important to use.4: Tire with high quality. Slightly tire leakage makes tire preure decreases over time is normal. It has nothing to do with this product installation.