1. Connect the usb receiver to the computer, copy the Android APK software to the U disk,2. Insert the U disk into the car's Android navigator, install the TPMS Android program,3. Start the program, match and usetips: Some navigators can be directly connected to the receiver to install akp software,Main Features:- TPMS for Android navigation: the receiver can connect to the car DVD/multimedia player/GPS navigation, install the app (included in the U-disk), and check the tire data on the screen, very convenient to use- Quick air leakage alarm: real-time tire preure and temperature monitoring, with 4 tire data displaying on your DVD screen, prevent tire burst, extend the tire's life and save fuel- Abnormal alarm: after connecting to the car DVD, it will send you the sound prompt when abnormal occasions occur, such as high and low tire preure alarm, high temperature alarm, etc.- Accurate and durable: with advanced and profeional technology, ensure the stable signal and accurate dataspecificationSpecifications:TPMS Receiver:- Working voltage: DC 5V- Working current: le than 15mA- Working frequency: 433MHz- Working temperature: -40 - 85 Deg.C- Connector: USBInternal sensor:- Working voltage: 2.1 - 3.5V- Working frequency: 433MHz- Preure measuring range: 0 - 116 psi (0 - 8 bar)- Temperature measuring range: -40 - 125 Deg.C- Working temperature: -40 - 125 Deg.C- Battery: built-in CR2050 (3V, 330mAh) button cell