Flexible Helmet LightSenticam bike helmet light fits any helmet, coming with two lengths rubber strap for snug fit, also fits handlebars + frame. Helmet fitting fully rotatable for covnenient mounting.400 Lumens Lighting PowerReally powerful front and back lights built in, 400 lumens LED front light, 15 lumens back light.USB RecharegableOur bike light can be easily charged with supplied USB cable. Up to 5 hours lighting per 1.5 hour charge,Multi Mode - Bright, Battery Saving, FlashSuitable for any environment, change mode from flash, to super bright to battery saver. Use a front or rear light or dual front/rear helmet light or handlebar front light. Single press the square button on the top of the light to turn on the front light or switch modes, double press in quick succession to turn on the rear light or switch modes, long press to turn off the light.