Dimensions: length 7 cm, width 3 cm, thickness 2.3 cm Ensure the safety of your pet: install it on the collar, allowing vehicles to see your dog in advance in the dark, preventing your dog from encountering unexpected dangers during nighttime walks. LONG LIFESPAN, USB RECHARGEABLE: This light comes with a 120mA capacity battery with up to 9 hours of battery life and can be fully charged in 0.5 hours using a micro USB cable. Multi-colored and super bright: This dog safety light displays 7 different color changes; fast flash, slow flash, steady glow. Visible distance in the dark up to 500 meters. You will receive 2 pieces LED dog safety lights. Note: The data is all measured manually, please allow error of 1-3cm Due to differences in light and display, there may be color differences, please refer to the actual item received.