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Dear Customer, We appreciate your inquiry. The operational speed of the device is 1400 RPM. The switch located at the top is used for gear adjustment. The back degree represents the torque value, you can make adjustments by using the "+" or "-" accordingly. This unit is equipped with an integrated lithium battery, which can be recharged via a USB type C port. It contains three internal lithium batteries with a standard voltage of 10.8 volts, reaching up to 12.6 volts when fully charged, and please note that the battery is built-in and cannot be removed. We hope this information helps! If you have any other questions or need further assistance, feel free to contact us at [email protected]. Our team is always ready to assist you. Best Regards, HOTO Customer Service Team
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