ONE SWITCH CONTROLS 3 LIGHT MODES. CLICK1-HIGH LIGHT ON. CLICK2-(HIGH-LOW-FLASH) ON. CLICK3-LOW LIGHT ON. FEATURES AN ADJUSTABLE LIGHT BEAM BY PUSH/PULL FOCUSING ACTION. IT CAN BE ATTACHED TO A BICYCLE. USB CHARGING PORT ON THE BOTTOM. IT CAN BE CARRIED AROUND, WITH ROPE DESIGNS ON THE SIDE. THIS WILL PROVIDE CONVENIENT, HANDS-FREE LIGHTING WHEREVER NECESSARY. THE POWER SUPPLIED BY 1800MAH, THE LIGHT CAN REACH A DISTANCE OF 328FT. 4 1/2" L X 1 1/4" DIAMETER