Easy and affordable way to keep track of your dog at night. Bright, long-range light is waterproof and submersible. Adjusts from solid to blinking light with the push of a button. Easily attaches to a 3/4" or 1" collar strap or D-ring. Runs for 250 hours on two CR-2032 batteries (included). Imported. Colors: Blue, Red, Green, Yellow, White.