High-voltage ultra-fast recycling for up to 400 full power flashes with shoe-mount flashes. Turbo SC's fuel gauge lights indicate remaining battery capacity and charging status. Unbelievably small and compact: about the size of a 3-1/2x5 Inches (9x12 cm) index card, only 1.3-Inch (3.3cm) thick, weights less than a pound (0.4kg). Works with most shoe-and handle-mounted professional-caliber flashes, and all Quantum Qflash T-series portable flashes. Unlike other types of batteries, the TURBO SC has no memory. You can top off your TURBO SC at any time, or give it a quick charge to get a few more shots.