This is the longest history 2 wheel high speed electric scooter in the world started from 2002,very mature and stable quality ! Motor : 10 inch brushless hub motor 2000W,which can climb any slope in the world Battery : 72V20Ah NMC lithium battery, Controller : 40A FOC controller with reverse performance. TOP Speed : 50km/h Range : at 30km/h cruise speed and 70kg rider, max range 75kms Brake : front disc and rear disc brake plus EABS regenerative brake Container qnty : 52 pcs/40'HQ The battery supplier is the biggest listed company in China,TOP 3 in field of power battery.... don't need to worry about battery warranty and performance !