Aviditi BC504-M 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 3 Different light settings: Flashing, non-flashing, and off (for daytime use); Simple push-button operation Lightweight, durable, weather- and water-resistant Color: Black with blue LED Lights Size: Medium; Measures 1-Inch by 17.7-19.7-Inch (2.5cm by 45-50cm)