Voltage range 4.0-12V Battery capacity 2400 mAh/1800 mAh Use time 8-10 hours/6-7 hours Dual mode: Standard mode/8V strong start mode Display "J" for forced start mode Display "S" for standard mode After pressing and holding for 2 seconds to switch modes, you can adjust the button to tap the acceleration button. Switch mode again to switch to billing increase button Long power switch button = on/off, Short press the button to flexibly set pause or resume (resume paused mode) Quickly double-click the switch key to switch modes Press and hold for 2 seconds to switch working mode, switch between prick or regular mode Note: This battery is only suitable for Soldier Max wireless tattoo pen machine