The AB Night Vision battery pack is a low profile pack designed to be an alternative to standard ANVIS 6/9 battery packs originally designed for aviation applications. A helmet mounted battery pack that can be used as a counterweight. The pack is activated with an easily accessible power knob. It features an 18inch LEMO cable for a multitude of routing options to best fit the users helmet configuration. Machined from derlin and aircraft grade aluminum alloy, it is impact/crush proof and water resistant. Compatible with (2) CR123 or (4) AA batteries.