TD-383 is a power pack for Nikon flashgun. Using two groups of symmetrical charge system, it"s more stabile charging voltage and faster recycles time. Flexible and convenience to use choose charging with one or two group freely. Stand-by power consumption is more save and recycle power compare with similar product. The flashgun power pack has built-in thermal protection switch, when the frequent use lead to thermal. Protection of power pack, it stops working. However, the battery pack will continue work after cooling. Specification: Power: 8x AA type alkaline or NiMH batteries and AA-size lithium batteries can also be used (Not included) Dimensions: 170 x 72.5 x 25 mm Weight: 168g (without batteries) Compatible with: Nikon flashgun: SB-800, SB-80DX, SB-28DX, SB-28,SB-27, SB-26, SB-25, SB-24. Package contents: 1x Flashgun power pack 1x Protection Soft case 1x Camera connecting installation screw