About the Plus Front Light - 40 Lumen The Knog Plus 40 Lumen Front Light is a great versatile light that you can mount anywhere and everywhere - handlebars, front forks, your jersey pockets and even your bag with integrated clip. The USB rechargeable light is convenient and easy to use, with its 5 modes to suit all sorts of environments. Featuring super long runtimes, this light will get you through the morning commute with ease. Key Features > Light Source: COB LED\\\'s > Brightness: 40 Lumens > Power Source: USB rechargeable lithium polymer > Charge Time: 4hrs > Dimensions: 14mm (W) x 66mm (H) x 18mm (D)