A lithium-ion battery with a capacity of up to 2000mAh guarantees uninterrupted operation up to 5 hours. In turn, quick charging using the included USB cable makes breaks in work very short. Despite the small size, the power supply has full voltage regulation every 0.1V in the range of 5-12V. The whole is operated using two buttons located in the upper part of the housing. Right next to it there is a clear display showing 3 different values: voltage battery level in percent time from switching on the power supply (resets after each switching off) There is also a jump start mode for tattoo machines that need a bit of extra power to get going. The most important features include: compatible with any machine with an RCA connector battery capacity: 2000mAh working time up to 5 hours charging time 2.5 hours jump start mode dimensions: 67mm x 29mm x 23mm weight 44g regulated voltage every 0.1V in the range of 5-12V The set includes a power supply and USB charging cable