FIREFLY - Dog Safety Collar Flashing LED Adjustable - RED FIREFLY LED light glows and flashes in darkness. Batteries Included. Helps to keep you and your dog & other pets safe during walking. Easy to use: simply pushing the control button makes the light vary in 3 Easy-Click modes: Rapid Flash / Slow Flash / Constant ON and OFF. Easy and comfortable to wear , strong clasp to secure it. Branded Packaging great for special gifts.