Product details:
power: flash 4xAA alkaline batteries,
external battery pack: 2 × 4GP 2400mAh NiMH batteries
Note: use one group, just 4 battery, use two group, need 8 batteries, and there is no battery inside the package.
working condition: give 1/1 full brightness flash per 30s, if charging can not be completed within 30 seconds, considered as energy depletion.
Compatible flash: Canon 580EX?,580EX, 550EX, MR-14EX,MT-24EX,600EX-RTCarbose Industrial limited