USB rechargeable lithium ion battery for 36 hours of runtime from a 24 hour charge \n 1/2 watt Power LED plus 2 eXtreme LEDs for visibility up to 1 mile \n Steady and attentiongrabbing Superflash flashing mode \n Highly visible, even in daylight \n Ultra compact vertical design is weatherproof, lightweight and durable \n Includes bike mounts and clip mount for multiple mounting possibilities \n Soft touch button has affirmative feel, even with gloves on