Multifunction plastic light reflector has blinking and solid light settings. Swivel clip allows for easy attachments for those on the move. Includes 2 button cell batteries. Red light behind each reflective panel with solid or blinking function. Button on back. Batteries come inserted (type CR1220). The only way to change/replace the battery is by using a tiny computer screwdriver - 4 screws in back of unit. Each piece has 3 tiny white lights at the bottom edge of the unit, all colors include a red light between the reflective panels.