Aviditi BC303-M LED Lighted Dog Collar, Green with Red LED Lights Helps you and others see your dog while out on walks at night or in the dark 3 Different light settings: Flashing, non-flashing, and off (for daytime use); Simple push-button operation Lightweight, durable, water- and weather-resistant Color: Green with red LED lights Size: Large; Measures: 1-Inch by 13.8-19.7-Inch (2.5cm by 35-50cm)