?High quality motor and durable battery This electric bicycle is equipped with a 48V high capacity detachable lithium battery with a range of up to 25 miles. The battery is durable anti-theft. The high-quality 500W brushless motor allows you to easily climb hills with a speed of up to 20mph?The default maximum speed is 15MPH and after lifting the speed limit it can reach 20MPH ?Comfortable riding experience This electric bike features adjustable height seats that meet everyone s riding needs disc brake front hydraulic shock absorbers and 14 inch inflatable tires greatly enhancing riding safety and comfort ?Easy installation The installation of the this electric bike is very simple and most of it has been completed. We provide clear instructions and tools so you don t have to worry about installation issue ?After sales guarantee This electric bicycle provides a one-year limited warranty. If you have any problems please contact me at any time through Wal Mart and we will provide you w