Intended for photographers on the road, the two monolight Indra500 TTL Battery Kit from offers a design driven by portability, flexibility and power. Both power cord-free and sync cord-free, the Indra500 is also hassle-free thanks to the Odin receivers for Nikon and Canon cameras built-into every unit. starts with a flash head with all the qualities of a studio flash such as 500Ws of power, adjustable from 1/128 to full power over an 8-stop range. Recycling time is 0. 1 to 2 seconds with the included Li-ion polymer battery and 0. 1 second with the optional AC adapter. Action-stopping flash durations as short as 1/15,000 (t. 1) sec. are possible at reduced power settings for freezing splashes or peak-moment sports shots. The Indra500 TTL 4-channel Monolight offers a design driven by portability, flexibility and power. Both power cord-free and sync cord-free, the Indra500 is also hassle-free thanks to the Odin receivers for Nikon and Canon cameras built-into every unit. starts with a flash head with all the qualities of a studio flash such as 500Ws of power, adjustable from 1/128 to full power over an 8 stop range. Recycling time is 0. 1 to 2 seconds with the included Li-ion polymer battery and 0. 1 second with the optional AC adapter. Action-stopping flash durations as short as 1/15, 000 (t. 1) sec. are possible at reduced power settings for freezing splashes or peak-moment sports shots. The Indra500's battery is the key to taking studio quality light out into the field. Photo sessions can have a fluid quality not possible when tethered to an AC cord; setups change in seconds rather than minutes - assistants can even handhold the lights. The battery gets 400 full power flashes on a 5 hour charge and thousands at minimum power. This would be an impressive flash head if had just stopped there but the Indra500 is also TTL capable with Nikon and Canon cameras, allowing photographers to seamlessly transition in rapidly changing light conditions using their camera's auto-exposure technology. Using the optional transmitter, TTL power can be adjusted remotely +/- 3 EV, while manual mode has an expanded 8 stop range. Items Include: (2) Indra 500 TTL Studio Lights (2) Indra 7" Reflectors Straight Studio Light Power Cable 5m Straight Studio Light Power Cable 3.5m Indra Battery Body Indra 5000mAh Li-ion Cell Indra Battery Pack AC Charger with AC Power cable Indra Li-ion Cell Cover Indra Battery Pack Shoulder Strap Bag User manual (in USB)