ABS Plastic|Two LED light functions: strobe light and continuous on|Press button once for continuous on and twice for strobe|Press a third time to turn off|Utilizes button cell batteries (inserted and separated by pull tab)|Clip onto bag, strap, belt loop or key chain to keep handy|Push ring in to attach to your bag or to attach key ring|Use while biking, walking, jogging and hiking to be sure you are noticed