Ultra bright LED light
High intensity LED
Extensive lifetime of LED (100,000 hours)
Adjustable head strap
Keep lamp from bouncing
Adjustable inclination
3* 1.5V AA size batteries (not included) to make it ultra bright

Battery replacement
Twist to open battery cover, remove the battery cartridge, remove old batteries and insert new batteries in the correct polarity and twist the battery cover back (3*1.5V AA size batteries included)
Glide back the battery cartridge into the case on its own track (don't force)