Used for about 5 hours. The condition is very clean, but one battery has a problem. The part protecting the battery display came off, so I tried to reinforce it, but I applied too much adhesive, and it spread inside, causing it to become cloudy. When I tried to remove it again with precision tools, there are scratches. It can be used without any problems, but the appearance is unfortunate. Please check the photos. The following is a quote: Equipped with the same FAULHABER motor as Bishop and a black IC board on the same level as Cheyenne and FK IRONS. A machine that exceeds the standard of tattoo machines in terms of price and quality has been completed. SS ONE, jointly produced by "ai-tenitas" and the German motor manufacturer "FAULHABER". With FAULHARBER's outstanding motor technology and ai-tenitas' unique electronic control technology, it is a powerful and stable machine. 【Specifications】 ・Motor: FAULHARBER brushless DC motor ・Motor speed: 1620-10020rpm ・Stroke: 4.0mm ・Needle depth: 0-4.5mm ・Battery capacity: 2000mAh ・Switch frequency: 27-167Hz ・Weight: 168g ・Size: 32 x 125.8mm ・Continuous operating time: 5-10 hours 【Set Contents】 ・SKETCH STEAM ONE machine body ・Batteries x 2 ・USB Type-C cable ・User manual