Power source - DC 12V (Universal adapter EU/US AC 100-240V is included). Power consumption - not more than 400mA. Power supply disconnection doesn't cause current time error. The clock comes with a full instruction manual! All scratches and abrasions of the case, as well as of some rare elements are historical features of the product and the time effect.
Feel free to ask any questions, and I will try to answer as soon as possible. My items are always packed carefully.