Aviditi BC204-S LED Lighted Dog Collar, Green with Green 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: Green with green LED lights Size: Large; Measures: 1-Inch by 17.7-20.5-Inch (2.5cm by 45-52cm)