Functions: 
Waterproof to ensure durability of headlight 
Lightweight design to reduce burden experienced by the user at the head, able to wear the headlight comfortably for long hours 
Headstrap is adjustable, allowing users to adjust the headstrap according to their preferences and comfort level - securely attaches to user's head, helmet or hat to prevent light from bouncing up and down 
Inclination is adjustable according to needs and demands of applications
Extensive lifetime of the LED light of up to 100,000 hours
Suited for use in outdoor activities, carrying out works in dark or badly lit areas or underground
Requires 3x AAA batteries which are sold separately