This is the adapter included with many rechargeable personal models of Eagletac flashlights.
Get a spare to use as a second charging location, such as having one at home and another second at work. Bring one along to charge on the go if needed, with a backup at home in case the carried one gets misplaced.
These can even be used in place of a fast charger (such as for smart phones), for gentler charging that will help extend the total life span of the battery.
Input (Wall Outlet) :
Voltage : 5V
Max Amperage : 1A