MA4303 means it supports AV-IN and FM function.
MF4303 means it supports FM function.

Function Description:
1 OS: based on Microsoft Windows CE. Net 6.0
2 CPU: SiRF Atlas IV 500MHz
3 4.3 inch TFT LCD(480*272)(16: 9) touch screen
4 Connector: USB 2.0(high-speed)
5 Audio output: Built-in speaker, FM, Automotive acoustics, navigation, WMA, MP3, MP4, FLASH display
6 Navigation: Voice navigation, high sensitivity receive, localization is accurate,
7 deviation within 2---5 meters
8 Memory: 128M(2G/4G) Bytes
9 Expansion slot: Supports TF card
10 Language: Multi-language support
11 Battery: With input 850MAH Lithium battery
12 Size: 119*77*12.5mm
13 Support AV-IN input (Optional)
14 Accessories: Main Unit, AC Adapter, StereoHeadphone, Carmounting bracket, Car
15 lighter adapter, User Manual, handwriting pen, warranty card