Aviditi BC403-S LED Lighted Dog Collar, Blue with White LED Lights Helps you and others see your dog while out on walks at night or in the dark 4 Different light settings: Slow-flashing, quick-flashing, non-flashing, and off (for daytime use) Lightweight, durable, weather- and water-resistant Color: Blue with white LED lights Size: Medium; Measures: 0.79-Inch by 15.7-19.7-Inch (2.0cm by 40-50cm)