The Light-Up Display contains 12 pieces and includes 3 Silicone Blinker Lights, 3 USB Blinker Lights and 2 each of the Light Up Neck Rings in 3 sizes. Keep your dog safe with maximum visibility during nightly walks and activities. The Silicone Blinker is powered by a replacement battery and lasts approximately 100 hours. The USB Blinker Light is easily charged by a standard USB charger and lasts approximately 5 hours. The Light Up Neck Ring has an on/off button and is easy to switch from a steady light setting to an eye-catching pulse for ultimate visibility.