About the Topeak Headlux Helmet Light The Topeak Headlux is the ultimate safety light, mounting to any helmet and allows you to ride safe and be seen at night. The innovative multifunctional double sided helmet mounted light, shines white facing forward and red towards the rear, featuring 4 bright LEDs with a wrap around lens so you have a clear 360 degree visibility. You have some handy top mounted button controls that give you 3 different light modes, so you can change the function on the go. Great idea if you haven\\\'t got the space or time to mount lights onto your bike frame. . Key Features Light Source: LED light Brightness:10 Lumens Power Source: Battery: Lithium \\\"CR2032\\\" x2pcs (Included) Run Time: 70 hr white Constant / red Blinking 100 hr white Blinking / red Blinking 50 hr white Constant / red Constant Mounting: Helmet / Road bike dropbar Light modes: White Constant / Red Blinking White Blinking / Red Blinking White Constant / Red Constant Dimensions: 6.5cm (L) x 3.5cm (W) x 3cm (H) Front/Rear/Set: Set Weight 24g Lighting Buying Guide