【EASY TO STORE】- Detachable hopper is large enough to hold 150balls, and designed for space saver storage. Suitable for both professionals and beginning tennis player. 【LIGHTWEIGHT AND PORTABLE】- Weighs only 40 pounds, lightweight design makes putting it in or taking it out your trunk a piece of cake. With two 6in wheels and one extension-type handle, it is easy to be moved over grass and curbs to the court. 【APP FUNCTION】- Download our app ''TenniSmash Remote'' to control the machine. Serving speed, frequency and mode can be adjusted with a simple click at your phone. Support left and right oscillation, up and down oscillation, random balls, smash balls. Also can count your ball hitting number daily, weekly, and monthly. Support Android and iOS system. 【LONG BATTERY LIFE】- Strong motor ensures steady and powerful serve. Large capacity 16AH lithium battery can provide 6-8H operation and make sure you will get enough court time before next charge. 【DURABLE MATERIAL】- Constructed of ABS shell, durable and sturdy. Driving wheels inside the body made of premium polymer composites, designed to reduce wear and tear on tennis balls, thus prolonging their service life.