Size Name:17397(16G) Product Model: M4271; Bulit-in Bluetooth handsfree w/ Stereo Music Playback,Contacts Synchronization. Built-in WIFI, connection to phone's hotspot could perform better with wireless internet(improved and is much better since March,2017). Highly integrated with 3rd party devices(USB Dash DVR,Mirror Link,BT OBD2,TPMS,DVD ROM box). Sleeping & Quick Booting - Start your car and access system within 2 seconds Full HD 7" 1024600 Capacitive Touchscreen RAM: DDR3 1G. NAND Memory: 16Gb(M4272 has 32Gb available). CPU: MTK Soc-based Quad-core 1.5Ghz. GPU: ARM Mali-450 MP4 Built- in Max 445W Amplifier with RMS 424W(Vcc=14.4v,THD=10%) Built-in FM/AM Radio Tuner w/ RDS OS: Optimized Android 4.4 System Language: German, French, Italian, Spanish, Portuguese, Arabic, Russian, Japanese.Orignal Steer Wheel Control keys still work if it uses analog signal to control Inputs,Outputs & Slots Back cam input AUX AV IN Audio Out Subwoof Out One Micro SD slot - to store media files,dash DVR records(up to 128Gb) 3USB Slot - Allows to connect with up to 256G USB Drive, and optional USB devices(3G Modem, Dash DVR Cam,or smartphone) 2 Din size:178mm 100mm, with front panel size 178mm101.5mm Features: ONLY takes less than 2s to boot - listen to radio or musics without waiting FULL EasyConnect App features (compatible with latest Android 7.0! Other sellers can't), and Google Voice Command compatible(voice dialing,voice opening local App,voice Q&A;) MORE usefull options from built in Steering Wheel Study App for user to match & re-define,especially voice command shortcut option Music name/singer will fully display from headunit when play music from smartphone via bluetooth A2DP Be ABLE to install most apps: Tomtom,Waze, iGO, Google Maps,Here,Spotify, Pandora, Play Music, Amazon, & more Notice: This unit does not have ipod interface/headrest video output