Red Dingo LT-ZZ-DB-LG Lumitube Illuminated Dog Safety Collar, Bright Blue - Large To XL Our light-up collars are weather proof and waterproof for swimming with multiple seals. The bright LED light operates using AAA batteries &#40;alkaline or rechargeable&#41;. Color - Blue Size - Large to XL Dimension - 32 x 1 x 0.5 in.