Product Info: KOOWHEEL 2nd Generation Kooboard Dual Motor Electric Motorized Longboard 4 Wheels Electric Skateboards The video url is http://cloud.video.taobao.com/play/u/3679811350/p/2/e/6/t/1/50135568210.mp4 Daily Maintenance 1.Check the condition of wheels to make sure it rotates freely before each ride Check the trucks and wheels to make sure all components are firmly tightened. 2.Do not ride the board if you hear any abnormal noise from wheel or motor bearings 3.Always store your board in a dry and ventilated location. 4.Keep away from damp occasions to avoid damage to PCB boards and battery. 5.Only use a Koowheel Charger. Other uncertified chargers may cause safety issues. The battery should always keep in places where temperature under 60Celsius degrees. 6. Oil the bearings regularly --------------Skateboard-------------- N.W:7.3KG Size:920*240*130mm Battery Range:35-40km Hill Grade(%):25 Max Load:130kg Power:350W x2 --------------------Deck----------------- Material: 7-ply of Canadian Maple Wood ------------------Battery----------------- Capacity:36V-5500mAh Type:18650 lithium-lon Weight:1.7kg Charging Time: 2 Hours Charging Times:1500 times ---------------------Motor----------------- Type: Dual Brushless Hub Motor Max Speed:43km/h ------------------Wheel-------------------- Material: Quality PU Size:97*52mm ------------------Remote-------------------- Type:2.4(Digital Remote) Capacity:300mah Charging Time: 0.5 hour ------------------Charger-------------------- Input:AC110V-240V Output:DC42V2A Certificate: UL