Dragoart WX-2 Upgrade Wireless Power Supply Jump Start LED Screen 1500 mAh LED Screen Battery Pack for Pen Machine(RCA)
Battery - The charge time is about 2-3 hours. It can last 5-7 hours. The voltage range is 5 - 12 V. The battery capacity is 1500 mAh. If you prefer a little layback when you tattooing, then this is the right battery pack for you. Jump-Start Mode - Press the "+" and "-" buttons simultaneously for 3-4 seconds to turn on and off the jump start. Lightweight - The battery pack is only 55g. It is not short. If you want a pullback feeling, you can choose this one. Screen - You can the screen clearly when you with the barrier.
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WX-2 Battery Pack 
https://www.amazon.com/vdp/07cf2410f91d45fd884504584b1a63b6?ref=dp_vse_rvc_0
Dragoart
{"Package Dimensions": "3.62 x 2.2 x 1.54 inches; 3.21 Ounces", "Manufacturer": "Dragoart"}