1. The third gear speed regulation is 2 rpm-4 rpm-6 rpm respectively 2. The maximum load is 4KG-3KG-2KG according to the different rotation speed. 3. Forward and reverse direction function. 4. Set the rotation function of return travel according to the rotation angle, and the rotation angle of return travel can be set as 45-90-180-360 degrees respectively. 5. There are four power supply modes to choose from, which are USB direct plug AC power supply, USB power supply connected to power bank, three ordinary AAA batteries, and 18650 rechargeable lithium battery. 6. Description of the switch Reminder that this product is not equipped with a battery, if you need to charge it, please use it with a 18650 flat-head rechargeable battery. 1. Power ON: any button to turn on, short press to use. 1. Power ON: press any button. 2. R/L: switch clockwise and counterclockwise, short press to use. 2. R/L: switch to clockwise or counterclockwise. 3. SR: Speed switch, 2, 4, 6 rpm, short press. 3. SR: speed regulation, 2r/4r/6r/min. 4. A S A: Angle switch, 45-degree return travel, 90-degree return travel, 180-degree return travel, 360-degree return travel, short press. 4. ASA: angle regulation, 45°/90°/180°/360° circulation. 5. IN 5V: MicroUSB 5V external power input. 5. IN 5V: MicroUSB 5V DC IN. 6. Power OFF: any button to turn off, long press for 3 seconds to use. 6. Power OFF: long press any button for 3 seconds. 7.18650 lithium battery or 3 AAA batteries for power supply, (battery not included) 7.1865 lithium battery or 3 AAA battery(not included). 8.18650 lithium battery charging status indication, the IN 5V port is charging with diffuse red light, and the IN 5V port is fully charged with diffuse green light. 8.Charging LED indicator(built-in): red-charging, green-fully charged.