Features: Motorized dolly help to create stable video, great for macro low angle video shooting and short-time time lapse. Comes with a 1/4 3/8 convertible screw, compatible for various DSLR, ILDC camera, smartphone, action camera etc. (Phone clip is not included.) You can fix a panoramic ball head on it for changing camera shooting angle. (Ball head is not included.) Change the wheel angle to realize straight line / creative curve movement. Move in constant speed, max. 2.5cm/s, fewer battery power, slower speed. Powered by 800mAh CR2 lithium battery, can work for 1h for camera weighting 6kg, 9h for mobile phone. Reverse the battery, then the dolly can move to the opposite direction. Made of high quality aluminum alloy, support up to 6kg/13.2Lbs. Pocket size, portable for you to carry and store.