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 use tips: 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 pressure 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 pressure alarm, high temperature alarm, etc. - Accurate and durable: with advanced and professional technology, ensure the stable signal and accurate data specification Specifications: TPMS Receiver: - Working voltage: DC 5V - Working current: less than 15mA - Working frequency: 433MHz - Working temperature: -40 - 85 Deg.C - Connector: USB Internal sensor: - Working voltage: 2.1 - 3.5V - Working frequency: 433MHz - Pressure 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