Array of 36 powerful LEDs provide bright, 40W equiv. even lighting to a range of 25 feet Unique interlocking design allows stacking to create a multi-unit array Up to 2 hours total run time using the two 1000mAh Lithium-lon Batteries (1 hour per battery) Batteries can be charged via the included 110-240V AC Charger Securely connects to the shoe-mount on most Digital video cameras and SLR's