Aviditi BC102-S LED Lighted Dog Collar, Black with Blue 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); Simple push-button operation Made from durable black nylon webbing with super-bright LED lights Color: Black with blue LED lights Size: Medium; Measures: 0.79-Inch by 15.7-19.7-Inch (2.0cm by 40-50cm)