2. TD-381 uses a dual circuit charging system. Charging time is much fast than any other battery pack.
3. Convenient design; You can either use 4 or 8 AA batteries. It will be faster recharged when using 8 AA batteries.
4. TD-381 uses a new charging method, its save more than 25% power compared with original power pack. It also can be used with difference types of battery.
5. Compatible flash: nikon & Canon all flash