Warranty(from the date of purchase): 3 Months Warranty 30 Days Money Back Specification: Wheel size: 6.5"" Tire Charging Time: 3-5 Hours Using Time: 30-40 Minutes Range of Rider's Weight: 20~90KG(44-200LBS) Weight Range for Best Experience: 20~70KG(44-154LBS) Max Climbing Angle: 10 Degree Package Contains: 1 x Two-Wheels Hoverboard 1 x Power Supply Charger 1 x User's Manual NOTES: ▶Please fully charge before using for the first time. Pull the plug after charging to avoid overcharging. ▶Remember that the range of motion should not be too large, as far as possible to avoid excessive tilt. ▶Children should be accompanied under the guardianship of an adult, and the speed should not be too fast. ▶DO NOT swerve at high speed. ▶DO NOT start or stop operation on a slope, as to avoid damaging the self-balacning system or causing function errors. ▶DO NOT operate the hoverboard when the ""BATTERY LOW"" indicator on. STEPS TO CONNECT BLUETOOTH: 1.Turn on your phone's bluetooth; 2.Start the hoverboard; 3.Find the corresponding device which named as ""HY-A02"" and click connect. You will hear a sound like ""Ding-dong"" from the hoverbaord. Then you can open the music app and enjoy music. And the volume can be changed by adjusting the volume of your phone. HOW TO RESET: 1. Turn off your hoverboard. 2. Place your hoverboard on the ground, make sure your hoverboard is not tilting in any direction and calibrate balance in a horizontal level. 3. Hold down the power button for at least 20 seconds. 4. Power off the hoverboard and turn it back on. Please try resetting your hoverboard again if the first attempt did not solve the issue.