Thank you very much for viewing. A portion of the battery spring is missing. Aluminum foil was used to fill the missing part. Power and flash operation have been confirmed with two AA batteries. auto 20SR 【Manufacturer】 SUNPAK 【Application】 Strobe, Flash 【Contents】 Main unit 【Batteries Used】 2 AA batteries 【Condition】 Operation check: ● (Missing part of battery spring) Appearance: No major scratches or stains *This item is being sold as junk, so please consider the condition of the product before purchasing. Please consider the above points before making a purchase.