Argus Universal Strobe Battery Pack (USBP) features sturdy construction out of injection molded polymer plastic , designed to power the BNVD-1431 Mk.II as well as any other housings which are utilise Fisher or LEMO power ports, such as: AB RNVG, RPNVG, TNVC Artemis, LLUL-21. Mounting this is simple, it attaches via velcro to your helmet or head mount. Features: - Holds 4x AA batteries - Sealed and waterproof compartment - IR Strobe for identification under NVG - Included power cable for BNVD-1431 Mk.II (Fisher)