Built-in wireless speaker can be easily connected to portable devices in a second, just enjoy your favorite music or books without wearing headphones. Full of technology and easy to learn for beginners and amateurs. 36v/2.0 Ah li-ion batteries, dual 300-watt hub motors, quick charging, and longer using time. 6.5" high-quality rubber tires, non-slip and shock-absorbing pedals, can travel in safely. Specially designed for beginners, amateurs, office workers, and dog and catwalkers, free your feet a new way for transportation.