Top Plaza Pet Safety Collars Nylon LED Flashing Safety Dog Collar LED Dog Night Safety Collar Power source: LED light (Note: the color selection only for LED light, not for collar itself!!!) Light color: Blue, Yellow, Pink, Green, Red, Orange. Note: It is for Middle/Large-sized dog. Refer to size before ordering, please! Modes: Quick flash-slow flash-still on Battery: 2 * CR2016 button batteries (pre-installed) Specification: Length: Approx 420-530mm Width: Approx 25mm Product weight: Approx 60g