Take charge of the night! The HeadLux 100 USB features convenient cable-free charging with a direct USB port plug. Two super bright 0.5W white LEDs provide up to 100 lumens with three light modes. Bi-directional tool-free mounting and removal is accomplished by a single silicone strap making it suitable for mounting to handle bars forks or helmets. Great as an urban 'be seen' light or as a secondary back up unit. Simple to use and a great value. MAX LUMINOUS INTENSITY 100 Lumens LAMP 2 super bright 0.5 W white LED’s BATTERY 3.7V 500mAh Lithium Ion integrated CONTROL / BURN TIME APPROX 3 Modes: 1.5 hr High / 3.3 hr Middle / 40 hr Blinking CHARGE / CHARGE TIME APPROX USB port / 2 hr INPUT 5V 500mA LAMP HOUSING Engineering grade polymer STRAP MOUNT Fits integrated bar/stem combo and aero / round handlebars WATERPROOF IPX 6 WEIGHT 32 g / 1.13 oz SIZE 6.9 x 4.3 x 2.2 cm / 2.7” x 1.7” x 0.9” ADDED FEATURE Low battery indicator