The SP SMART is the highest-performance portable tennis ball machine you can buy. With a 300-ball capacity and ball speeds of up to 85 mph, the SMART is configured for battery operation, AC power, or as an AC-DC hybrid, delivering more speed and spin potential than any other portable machine in the world. This extraordinary performance capability is controlled by a microprocessor programmed with exceptionally sophisticated features. Offering 6–8 hours of playtime on a single charge, it’s built for high-level, consistent performance throughout your training sessions.