The USB Charging Cable works with the USB Port on the 9600-CHGR1 charger (that comes with the NSR-9500, NSR-9600, NSR-9700, NSR-9844XL, and NSR-9900 Series Flashlights) allowing the charger to be powered by any computer USB port or USB charging adapter. The auto-retractable design makes the charging cable small and compact for storage.