Mintek MDP-1770KIT 7-Inch Portable DVD Player Kit
Great device, good battery life
The small form factor and remote control give you lots of options with this device.  I'm generally very happy with it.  The only negative is the battery life. It doesn't seem to be nearly as good as it could be. For example I have an old laptop that can play multiple movies back to back without running out of juice. The same movies played in this device often don't make it to the end.  Other than that its a great device and I would recommend it.