Knob control speed: the speed range is 20-68 sec/rev. (the maximum speed is 20 seconds per circle & the minimum speed is 68 seconds per circle) Switch control the direction: On/Off switch control the direction. Both ways rotating controlled by red switch. Good performance: Smooth and quiet rotations which make it convenience to display the products and take photos of the products. Good portability: diameter is 7.87in and the net weight is 0.6kg, convenient to carry and keep. Application: Product display, like jewelry, digital product, shampoo, glass and other collectibles. Product photography, still life photography. Product photography, still life photography. Can also be used to create 360 Degree Videos. Ideal for Exhibition, Event, Party, Wedding and 3D scanning.