Pets Have Purpose LED Dog Safety Collar, Adjustable with Flashing or Steady Lights. Size: small (10" - 16") * LED Dog Collar - Lights up * 4 modes to choose from: Quick flashing, Slow flashing, Steady on, and Off * Visibility 200 meters in the dark. Walk or jog safely at night with your pet and be Seen! * Long life replaceable 50 hour battery included. Weather resistant * Color: collar is white/black, when turned on glows red. Size: Adjusts to fit neck sizes of 10 16