Model:LBW12A Charging time: 2~3hours Max speed:10km/h Maximum Load:54kg Working temperature: 5°c~40°c Charging temperature :5°c~40°c Stored relative humidity: 5%~85% Include: charger x1, instruction manual x1, hoverboard x1 Question list: 1, hoverboard not turn on. 2, hoverboard not balance. 3, hoverboard not move. 4, wireless speaker not work, but working before. 5, hoverboard be be ~ sound. 6, hoverboard shaking, but working well before. 7, hoverboard charger's light does not change from red to green. 8, hoverboard damage when you receive. Solution: 1, reset hoverboard to Product factory status(please see the card in package about how to reset). 2, contact seller to request new charger.(within warranty time) 3, contact seller to exchange new one. (within warranty time) 4, use different smartphone to test, find pair and connect Bluetooth. 5, make sure adjust sound volume, not 0. 6, if receive damage. contact seller and provide broken picture to exchange(within warranty time) If any questionS, do not hurry to return, please feel free to contact us via amazon messaga, we will give you the best support.