Question about Polaroid PS300 Li-Ion 57800 mAh

The specifications for this device are somewhat deceptive. Firstly, it is not 57800000mAh, but 57800mAh. Secondly, there should be a volt rating, otherwise you can't do anything with it. Please give either Wh or Ah plus a volt rating! This powerbank also has a 12V plug and therefore one could believe that it has approx. 700Wh, which is obviously not the case.