Souldio LED Dog Necklace Collar, trade; Pets LED Safety Collar Flashing Dog Collar with Batteries Dog Night Lights,Super Bright LED's Grow and Flash,Great Fun & Improved Dog Visibility & Safety(Blue) Dog Led Collar Improve dog's visuality and safety,6 super bright LED lights provide optimal visuality in darkness,reducing the risk of potential collisions Adjustable length, fit for medium dog and large dog,good for all conditions,comffortable for your dog Three Working Mode: Steady on, fast flashing,slow flashing led collar to keep dog safety and entertainment Battery Power Collar Easy to replace the battery, no any tools needed,very convenient