TPMS Bluetooth 4.0 universal external tyre pressure sensor V11 support Android & IOS phone Wireless 4 external Sensors With APP Attention:TPMS supports both Android and iOS, requires Bluetooth 4.0 or above. 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. 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. 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 pressure and temperature in cellphone. 3: 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. 4: Tire with high quality. Slightly tire leakage makes tire pressure decreases over time is normal. It has nothing to do with this product installation.