Tamrac MX-S536801 Memory & Battery Management Wallet 4 (Black) Tamrac's S.A.S. Memory &amp; Battery Management Wallet 4 is essential for any digital photographer. This wallet has four pockets to provide quick access to memory cards and batteries. It uses Tamrac's patented Memory &amp; Battery Management System, which uses red flags to identify available memory cards and batteries Quickly attaches to the shoulder straps or backpack harnesses of Tamrac products or to most belts.