Features: Flexible Auto Dolly Pocket size and lightweight auto dolly, made of high-quality plastic material, supports up to 3kg/6.6lbs load, 180°adjustable wheel angle allows you to achieve creative circle route/straight line movement. Perfect for time lapse/macro/panoramic shooting. Wireless Remote ControlThe wireless remote control can change speed & direction & make a pause, effective distance is 6m/19.7ft; support move to the opposite direction, and 3 levels of adjustable speed (2.4cm/s 2.6cm/s 2.8cm/s). Built-in Rechargeable BatteryBuilt-in 1800mAh rechargeable Li-ion battery can offer up to 6 hours service time; With USB charging port and charging cable, 4 light indicators showing charging status(red-green), battery power(flashing) and speed(normal on). Detachable Slide RailCNC machining and surface anodizing, the aluminum alloy slide rail adopts detachable design, flexible to select usage length(max. length 60cm/23.6in) and easy to carry; with a fix plate that can be installed on auto dolly and effectively prevent the auto dolly from falling off during operation. Flexible and Stable to Use1/4 inch to 3/8 inch convertible screw is suitable for most camera/ camcorder/ smartphone holder, and the extra provided ballhead can help you to achieve more flexible operation. The bottom 1/4 inch & 3/8 inch threaded holes of the track enables you to mount the slide rail to tripod for more stable usage. Specifications: Brand: Andoer Color: Black Body Material: Aluminum Alloy + Plastic Dolly Load Capacity: 3kg / 6.6lbs Dolly Built-in Battery: 3.7V 1800mAh Rechargeable Li-ion Battery (Included) Remote Control Effective Distance: 6m / 19.7ft Remote Control Battery: CR2032 Battery(Included) Slide Rail Load Capacity: 5kg/ 11lbs Dolly Weight: 296g/ 10.4oz Slide Rail Weight: 990g/ 2.2lbs Package List: 1 * Dolly 1 * Remote Control 1 * USB Cable 1 * Screw Connector 1 * Ballhead Adapter 1 * Slide Rail(Assembly Required)