For the budget conscious fine but has some quirks.

The main reason of the purchase was the combination of MP3, SD Card- player and speakerphone.
The installation went very quickly and easily by equipping, for the antenna connection but you need an adapter and a little violence, because the opening is a bit too small anyway. The processing of the device itself is rather cheap, what you hear when pressing the buttons (loud clack). The remote control is a membrane keypad and fine. Rather annoying, but acceptable the beep adjust the volume.

The user interface is clearly structured, the operation quite simple. The menu background is light blue, which is ok during the day, but at night rather violently hidden (brightness not adjustable). Positively surprised me concerning the adjustment. The button background color, you can mix together in addition to the preset color and even of blue, yellow and red. The manual is less revealing, on the Internet you can find anything, apart from the manufacturer's website in Chinese. The sound quality is mediocre to ok. When Loud feature I thought Hauts the discs out. Sound totally stump and far too much bass (in bass preset to 0).

USB Function

When I've been infected for the first time my USB Flash Drive (16 GB) was very little. An endless continuous charging indicator. Only after two or three times and pull reconnect it worked then. Hab then held with the distributor consultation that pointed forward, not every USB stick model works well only up to max. 4 GB. After I had found a small USB stick it worked well. The charging time remained then in limits (4-10 seconds, depending on how much is it). Unfortunately, skipping several albums on the menu does not work, then it freezes. Maximum in 2-3 albums steps possible.

SD card

Worked right away, faster loading time as the USB port, but also limited to 4 GB. Skip albums like the USB Stick.

Radio

Poor reception, with always something backround noise. Antenna amplifier necessary.

Bluetooth / hands-free

Pairing the unit went smoothly. You can either listen to music on the player (use over the phone) or even of apps such as. Deezer on his smartphone.
The speakerphone works perfectly, the built-in Micro makes having to scream for excellent intelligibility without.
Video
Does not work while driving. Has not worked for me with the handbrake on, but possibly also caught wrong in my car the corresponding wire.

Overview:
++ Bluetooth / hands-free
++ Price
+ Operation
0 Sound
- USB / SD Card
- Radio
- Brightness for night driving

Untested: Video input for rear view camera.

Conclusion: For the budget conscious in order, you have to be aware that no miracles can be expected for the price.