YELANGU L60ES YLG1847A-A 60cm Splicing Slide Rail Track with L5i Dolly Car 1. CNC machining , surface anodizing . 2. The product adds a fix plate the basis of the track , which can be installed on autodolly , which can effectively prevent the autodolly from falling off the slide rail during operation , causing damage to the photography equipment . The product slide rail pipeline is composed of three parts spliced, detachable, the length of the slide rail can be selected independently, and the effective distance is 62cm. Easy to carry and assemble . 3. The product is equipped with an adapter screw, which can be adapted to autodolly and can be connected to other photography equipment . 4. Adjusting nuts are provided on the four legs of the slide rail , and the slide rail can be balanced by adjusting the nut . 5. The both side of the track and bottom provided with 14 and 38 threaded holes , which can be connected to other equipment . 6. App operation 7. Freely choose AB point positioning and shooting, support video automatic loop shooting, without frequent operation. 8. Support time - lapse photography, parameter customization selection. can straight line and Curve shooting 9. The mini ball head can rotate 360 degrees in multiple directions shooting. Built in lithium battery, Support Type-C charging 10. The power is displayed in time, and the speed is adjustable from 0 to 100. Adopt stepper motor, precise control and low noise. 11. The maximum load-bearing capacity is 3KG, and it supports mobile phones, micro-singles, video recorders, etc., and there is no restriction on models. 12. The APPs shutter button supports most mirrorless cameras.