Product Name: LED-Digital Display Rechargeable Battery DC/RCA Connection Model NO.: DL-P03 Disposable: Non-Disposable Set: Not set Usage: for Cosmetic, Skin Care, Body Art Type: Tattoo Power Supply Material: Plastic Transport Package: Carton Origin: Jiangsu Product Description LED-Digital Display Rechargeable Battery DC/RCA ConnectionItem code:DL-P03Item Including:1x RCA/DC Lithium Battery1x USB charging cableInstructions:1.W1-L1 Battery Pack is a LED-Digital Display rechargeable battery pack that provides high and efficient performance.The charging voltage is 5V/1A for the power adapter.Charging Time:3 Hours.Usage Time:5-8 Hours,depending on personal usage and the tattoo machine.2.Output voltage between 4V-11V3.Hold + button for 8 seconds to turn on and hold-button for 8 seconds to turn off4.Press + and - to increase and decrease, respectively,the voltage by 0.1V5.The LED digits will start blinking when the battery pack is low in battery,please recharge the battery pack immediately6.The digits that show "0-100" when turning on indicates how much battery is left7.When charging, the LED digits outlines will start circling.once the battery pack is fully charged, the LED display will show a dash line (-) in the middle8.The package contains the W1-L1 Battery Pack and a USB Type-C cable