Check the ports on the tablet. Here on the Maylong M-150, you can see sockets for the power adapter and headphones, two speaker grilles, a mysterious dock connector that looks similar to the iPad's, and a microSD card slot.
Seem about right? How about a USB port for connecting to a computer or recharging? The specs list two USB ports and an Ethernet port, but where are they? Turns out that mysterious dock connector isn't what you'd think.