SMDV Hot Shoe Safe Sync Adapter SM-512 for Samsung NX100, NX5, NX10, GX-10, GX-20, Hotshoe Premium Grade Safe Sync, Made in Korea Safe Sync circuit regulates high voltage flash to 3v Keeps your camera from damage with old flashes and strobes Does not work with flashes 60v or higher; see description for details Uses 1xBattery 3V, CR 2032 (Included); battery check button to ensure flash battery used 24 Month Manufacture Warranty