Surface 604 Boar E350 Electric Fat Bike 350w+ (peaks at 750w); brushless hub motor provides silent peddle assist Great for everyday use and can handle almost any terrains - snow, dirt, light mud, sand, hills etc Multi-function display showing speed(including average and max speed),trip distance, battery level, assist Mode(0-5), and walk mode; Built-in torque sensor actuator for enhanced power management and smoother power delivery for a more natural ride 26 x 4 Kenda Juggernaut tires; ultimate traction tires suitable for extreme terrains 36V13.3 Ah/478Wh Samsung lithium ion battery - compact and removable; lasts up to 50 miles depending on mode