1、[Upgraded Heat Emission Holes Design]The addition of the heat emission holes at both side can help the auto dolly to cool down quicker during working, which give longer life to a new generation of camera video dolly. maximum 3kg load capacity and comes with a 1/4 inch and 3/8 inch mutual screw, the auto dolly can work with DSLR/ILDC camera, camcorder, sports camera, mobile phone, etc. 2、[Mobile APP Control]Supports mobile phone APP wireless remote control, you can scan the OR code on the users manual to download APP, which is compatible with for Android/ for iOS smartphone system, and remote control distance is up to 8M without interference. 3、[Multiple Photography Modes]Supports time lapse photography, parameter customization selection; can be placed on desktop or a flat surface for straight line/ curved line photography; supports video automatic loop recording without frequent operate, and A-B point positioning photography. 4、[Stepless Speed Adjustment]Maximum speed is up to 10cm/s, and the speed is adjustable for 0% to one hundred percent steplessly; adopts stepping motor, precise control and low noise, close range video can be recorded quietly. 5、[Detachable Slide Rail]CNC machining and surface anodizing, the aluminum alloy slide rail adopts detachable design, flexible to select usage length(maximum 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 operate. Specifications: Material: Plastic + Aluminum Alloy Load bearing Range: maximum 3kg Battery Capacity: 1800mAh Charging Time: About 3H Working Time: about 4H after fully charge APP Remote Control Distance: maximum 8M(without interference) Speed: maximum 10cm/s, Speed Adjustable 0% to one hundred percent Dolly Weight: 446g/ 15.7oz Slide Rail Weight: 990g/ 2.2lbs 1 * Auto Dolly 1 * USB Charging Cable 1 * Mutual Screw 1 * Rubber Ring 1 * Mini Wrench 1 * Slide Rail System(Assembly Required)