adapter output: 5 volts, 2 amps, 10 watt max. +--o)-- - this means positive on the inside and negative on the outside. I could not find specs to tell you the size of the adapter, but I would estimate it to be about 2mm. Yellow inside the adapter tip might also help. With this info, or if you have the DCadapter - go to your local radio shack (or similar) they should be able to help you find a suitable adapter. By the way, I did not see anything that says the tablet can be charged from a PC through the micro usb port. typically the output on a PC is 5 volts, 1 amp, which could do the job, but would take a long time. Also, PCs may need a driver installed in order to enable charging through the USB.