*DURABLE MATERIAL- Constructed of ABS shell, durable andsturdy. Driving wheels inside the body made of premium polymercomposites, designed to reduce wear and tear on tennis balls,thus prolonging their service life. *LONG BATTERY LIFE- Strong motor ensures steady andpowerful serve. Large capacity 16AH lithium battery can provide 6-8H operation and make sure you will get enough court timebefore next charge. *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. Supportleft 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. *LIGHTWEIGHT AND PORTABLE- Weighs only 40 pounds,lightweight design makes putting it in or taking it out your trunk apiece of cake. With two 6in wheels and one extension-type handle,it is easy to be moved over grass and curbs to the court. *EASY TO STORE- Detachable hopper is large enough tohold 150balls, and designed for space saver storage. Suitable forboth professionals and beginning tennis player. Notice: Please charge the battery before use. The service time after full charge is about 6 hours, and the charging time after power consumption is about 8 hours. Specification Voltage: DC 12 Load: 150 Balls Ball Speed: 20-140km/h Feed Rate: 2-10 Seconds Battery Life: 6-8h Net Weight: 19kg/42lbs Packing Size: 578x448x528mm/22.7x17.6x21in Package Content 1 x Portable Tennis Ball Machine(Support Android and iOS system)