1. 4 gears to adjust the speed, and it will automatically shut down after 1 minute of no operation. 2. LED gear digital display, using eye protection blue light design. 3. The motor can be rotated forward and reverse. 4. Green dust light, easy to distinguish dust. Easy to remove glue without hurting the screen 5. The battery is super strong and durable, it can work continuously for 10 hours, and the motor does not get hot or crash. 6. Type-C charging input
