Flash & Glow 100-Percent Silicone Wrap-Around Flashing LED Safety Light for Pets and People Easy-On, Easy-Off Bright LED Safety Light 100% Silicone, High-Visibility LED Lights, Easy to Attach to Collars, Leashes, Backpacks or Clothing, etc. Water Repellent, Replaceable Batteries (Included, 2 x CR2016) Keep You and Your Pets Safe at Night,assorted colors 3" x 1" x 1" - weight 2 oz.