1. Connect the usb receiver to the computer, copy the Android APK software to the U disk, 2. Insert the U disk into the cars Android navigator, install theAndroid program, 3. Start the program, match and use tips: Some navigators can be directly connected to the receiver to install akp software, Main Features: -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 Vehicle Sensors Tire Pressure and temperature monitoring, with 4 tire data displaying on your DVD screen, prevent tire burst, extend the tires 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 Vehicle Sensors 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 : - 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