The white one is rubbish, only runs on batteries and the mains adapter is not included. The black one is great, battery-operated and rechargeable with USB.

At the time of writing: The black one is the 710BT, which can print labels up to 24mm wide. The white one is the P300BT and prints strips up to 12mm wide. There is a white 710BTH, but it does not appear to be on the market at the time of writing.

Black is more professional