Adjustable Pet Safety Collar with Mounted, LED Bright White Panoramic Safety Light, Red Flashing Mode and Dim-down low battery indication -Pet Safety Collar Large - Xlarge (17" - 26" neck) Fixed at 45-degree angle and Contoured for Comfort Adjustable collar - compatible with all harnesses. 51/50 Advanced Technology, LED unit provides bright white panoramic floodlight Red flashing safety mode and Dim-down low battery indicator Eco-friendly, impact, water & weather resistant, lightweight