Bolt Cyclone DR PP-400DR Dual Outlet Power Pack Fast Recyle Time of 1 Sec | Up to 1400 Full-Power Flashes | For 2 On-Camera Flash Units Locking Feature for Secure Connection | Includes PP-400BP Removable Battery Pack | Lightweight (1.2 lb) Microcontroller Prevents Overheating | Includes 100-240V AC Charger | Neoprene Shoulder Strap Supplied Whats In The Box: Shoulder Strap, AC Charger BO-1008 with Power Cord - 5' / 1.5 m, Limited 1-Year Warranty