Floppy Ears Design USB Rechargeable LED Light-Up Safety Neck Loop, One Size fits dogs 13&rdquo; to 24&rdquo;, Orange Place over your dog's neck to be seen and safe in low light conditions 10 LED lights using USB rechargeable lithium ion battery with 2+ hours burn time and power cord included Loop around your dog's neck and turn the on/off switch to fast flashing, slow flashing, or constant beam mode Fits dogs' necks 13" to 24" simply cut to the size if needed This is not a dog collar and is to be worn with a regular dog collar