YELANGU L4X-BC Video Camera Dolly 3-Speed Motorized Electric Track Rail Slider Dolly Car for DSLR Camera/Camcorder Standard 1/4 and 3/8 screw holes with 1/4 and 3/8 screws can be used with various types of ballhead Can be shot in a straight line, equivalent to an electric slide Curved shooting, 360-degree uniform rotation shooting Can pitch shoot from an elevated angle Wireless remote control, remote control distance of 6 meters USB charging, convenient and fast It can be driven on the slide track Compact structure, foldable and portable Compatible with: DSLR camera, camcorder,mobile phone Specification: Material: aluminum alloy+ABS Load bearing: 3KG Voltage: 3.7V Battery capacity: 1800mAh Work time: 6H Body battery charging time: 3h Distance of wireless remote control: 6m Remote control standby time: 6 months Normal use of remote control: 60000 times Remote control continuous operation: 18h Remote control battery model: CR2032 The test speed for load capacity of 3KG, fully charged, on a horizontal plane, and in a straight line is as follows: 1st gear speed: 1.4cm/s; 2nd speed: 2.4cm/s; Third speed: 3.0cm/s Package included: 1 x Camera Dolly 1 x Remote Control 1 x Pan Tilt 1 x Charging Cable 1 x English User Manual