GreenLighting Silicone LED Front & Rear Bike Safety Light Bright LED light will make sure you get noticed at night Switch between a constant flash, alternating flash, or steady light cycle with the press of a button Can be mounted to the front or rear of your bicycle and is viewable from up to 500 meters away Includes 3 AAA batteries Measures 2.75" x 2.25" x 1.75"