KKMOL Multi-Function USB Variable Speed Cordless Rotary Electric Mini Drill Engraver Pen, Grinder Grinding Set - 5 Speed

Battery life varies depending on the speed setting and the task's intensity. On lower settings for light tasks, it can last longer, while higher speeds for demanding applications will consume power more quickly.

This rotary tool is suitable for materials like jade agate, wood, plastic, and circuit boards. It is designed for detailed work and light-duty tasks, not heavy grinding or metal fabrication.

Ensure the tool is off. Loosen the chuck by twisting it, insert the new accessory, and then retighten the chuck firmly.

While capable of detailed engraving on suitable materials, its power and battery life are best suited for hobbyist or light professional use. For continuous, heavy-duty professional engraving, a corded or more powerful model might be necessary.

Connect the provided USB cable to the tool's charging port and plug the other end into a compatible USB power source (e.g., a USB wall adapter, computer, or power bank).

Electronic Cell Protection (ECP) safeguards the lithium-ion battery against overcharging, deep discharge, and overheating, enhancing safety and battery lifespan.

Ensure the tool is fully charged. Check that the power button is pressed correctly. If the issue persists, contact customer support.

Turn off the tool. Ensure the accessory is inserted fully into the chuck and that the chuck is tightened securely. Check accessory shaft for damage.

The battery may be low; recharge the tool. Ensure the accessory is not bogged down or causing excessive friction. Clean any dust or debris from vents.

Reduce the speed setting or take breaks to allow the tool to cool. Ensure the vents are clear of obstructions. For prolonged use, consider a more powerful tool.