1、A buckle is added to the track foundation, which can be installed on the trolley, which can effectively prevent the trolley from falling off the slide rail during operation, causing damage to the photographic equipment. 2、CNC machining, surface anodizing is strong and durable, three parts spliced together, detachable, can choose the length of the slide rail, effective stroke 60cm, easy to carry, simple to assemble. 3、There are 1/4in and 3/8in threaded holes in the slide rail and trolley, which can be connected to other equipment. Add a small ball head to adjust various viewing angles to get more viewing angle options. 4、Four legs of the slide rail are equipped with adjusting nuts, which can be used to balance the slide rail. Support wireless remote control electric car, which can travel in both directions at three speeds. 5、The electric car can bear a maximum load of 3KG, and is easily compatible with mirrorless single‑lens SLR cameras, sports cameras, and mobile phone photography. 6、Trolley can also be used alone, adjust the angle of the auxiliary wheels, and can drive in a curve. 1 x Base1 x Buckle1 x Long Lock Screw4 x Screw Plug4 x Connector4 x Foot Nail2 x Tripod Board4 x Catheter1 x Trolley1 x Ball Head1 x Remote Controller1 x Charging Cable1 x Short Lock Screw1 x Rubber Ring1 x Wrench1 x Manual  Item Type: Camera SliderColor: BlackMaterial: AlloySliding Rail Length: Approx. 60cm / 23.6in(Effective Working Length)Wireless Remote Control Distance: 6m / 19.7ftWeight: Approx. 1870g / 66ozTrolley Speed:First Gear Speed: 1.4cm/s Second Gear Speed: 2.4cm/s Third Gear Speed: 3.0cm/sMaximum Load: 3KGMaximum Continuous Use Time 6 HoursBody Battery Charging Time: 3 HoursContinuous Working Time of Remote Control: 18 HoursNormal Use of The Remote Control: 60,000 TimesCar Battery: Built-in Lithium Battery 1800mAhRemote Control Battery: Built-in Button Battery CR2032 240mAhInterface: 1/4 Screw, 1/4in Screw Hole, 3/8in Screw, 3/8in ScrewPTZ Type: Ball Head