The speakers have limited low quality affect making it difficult to hear the audio in the movie with other surrounding sound. You would have to have extremely acute hearing or a complete silent area. The unit feels so like that you are wondering if it will break on a slight drop so best to be careful to not drop this particular unit. For the price it feels like your missing out on the value of your money. Of course this is just my opinion. If had to do over again I believe I would not have paid over $60 for something of this nature.
I purchased this particular unit because of how cool it looks and it has performed beyond my highest expectations, it has a really good picture quality, I've only tinkered with the USB reader and I like that feature a lot I'm guessing that the SD card reader works in a similar way just pop the card out of your device and show off the pictures from the classic car show, or that awesome vacation instead of trying to look at it from a tiny camera screen or phone screen. I'm really happy with mine. Great product.