Aigou Dog Collar Safety Light, LED Clip-On Pet Safety Light Blinker Flashing Collar Keychain for Dog Set of 5 (Orange + White + Hot Pink + Blue + Yellow) Secure stainless steel carabiner -Water resistant Push button on/off switch, Flash or Glow mod which has bright LED area light Dog collar safety light is designed to keep you and your pet safe - Visible for more than 1/2 mile Dimensions: approx. 1.26" x 0.75"(Diameter and thickness) Dog collar blinker lights comes with five colors - white, green, rose red.