Light in the Dark LED Pet Collar: Super bright in the dark, makes your dogs and cats visible and safe at night when you walk your dog at night. USB Rechargeable Dog Collar: This collar can be rechargeable via Micro USB charging cable after power off. ADJUSTABLE SIZE FOR SMALL DOGS AND CATS: This small dog collar is specially designed for small breed dogs and cats, and can also be adjusted by buckles to ensure a better fit. 3 FLASH MODE OPTIONS: You can choose between constant lighting, slow flashing or fast flashing by simply pressing the button as needed.