Flexible Battery Options: AA145 is compatible with AA batteries and comes with rechargeable batteries, which can boost the maximum output to 800 lumens. Powerful enough for everyday use, walking, camping, hiking, etc. Includes 1.5V AA batteries, 3.7V AA batteries and USB-C charging cable. (Note:3.7V AA battery full 3 hours, 1.5V AA battery full 2.5 hours.) Versatile Brightness Settings: Momentary mode is a long press and release to turn off. Rapid double-click to turn on from the memorized mode, click to cycle through Moon-Low-Med-High. Rapid triple-click to turn on strobe mode. It's perfect for your daily life.