BaoCore/ BXT Dogs Pet Shiny Flashing LED Belt Colorful Adjustable Nylon Pet Collar Dog Cat Safety Necklace With Reflective Effect S/M/L/XL Material: Polyester webbing, fish screen translucent surface, ultra-bright light guide flat fiber (new material) S:Suggested neck circumference:13.3"-17.3",Width:0.98",Length:18.5",Weight:47g M:Suggested neck circumference:14.5"-18.8",Width:0.98",Length:20.47",Weight:57g X:Suggested neck circumference:16.1"-20.8",Width:0.98",Length:22.4",Weight:62g XL:Suggested neck circumference:16.5"-25.59",Width:0.98",Length:27.55",Weight:65g 4 flashing mode: Quick flash, Slow flash, Keep Lighting and turn off. Adjustable buckle lets you find the perfect fit for your dog's neck When light flash on the collar, it will reflect it at dark night,safer for your dog when the battery is power off at night