Free rear camera and external microphone are included!!!General:Operating system:Android 7.1 system7 inch HD capacitive touch screen High reselution:1024*600pUSB:2 channels,up to 32GTF card :1 channel,up to 32GMulti-languageBrightness adjustmentCar logo selection1GB RAM+16G ROMBluetoothSupport hands-free call,downloading phonebook,searching calling history,playing bluetooth musicExternal microphone for clearer callGPS/NavigationOnline navigation:you can download map apps from google play store,like google,sygic,wazeOffline:North America Map pre-loaded,you also can save the offline map in microSD card setting for offline navigationWIFI/3G/4GEasy to connect WiFi or hotspot from your smart phone.3G/4G:you need to buy extra 3g/4g dongleMirror LinkPhotos,videos,online navigation maps can display in this high definition screen through pre-installed "EasyConnection" APP.Android Phone:via USB or WIFIIphone:via WIFIRear camera Free 170 degree wide angle waterproof HD rear view camera is includedAuto display reverse imageRadio(AM/FM)AM Frequency Range:530-1710KHzFM Frequency Range:87.5-107.9MHzOther Feature:Support OBD2 function via bluetooth (need extra device)Steering wheel controlSelect color of button lightSetting wallpaperRCA video output:2 CHRCA audio output:2 CHAUX audio/video inputSubwoofer OutSupport install APKEQ settingAudio format :MP3,APE,FLAC,AAC,WAV etc.Video format :RMVB,RM,MP4,MOV,AVI,MKV,MPEG,3GP,FLV etc.Support 1080PImage formats :JPG,GIF,PNG etc.Package:1*car stereo head unit1*power cable1*GPS antenna1*backup camera1*external microphone1*user manual2*metal kit