Note: This product does not include the AirTag positioning device, it is just a protective collar. Other demonstration accessories in the picture are not included!PLAY PROOF COLLAR - Our gas tag collar holder makes it easy to keep the gas tag on your dog at all times. We use heavy-duty buttons and durable straps to ensure your aviation tags are securely attached to our collars.PROTECTION - We designed our dog tracker collar with GPS with a built-in pocket to ensure a perfect fit for your Apple AirTag, providing full functionality to the device without the worry of loss or damage.LONG-LASTING COMFORT - Our airmark dog collar features durable nylon woven material on the bottom, making it breathable, flexible and comfortable. Combined with reinforced PU leather, this is an air tag collar that dogs will love.USE IN ANY WEATHER - We designed the dog collar air tag holder to keep the air tag protected from the elements. The PU leather holder on our aviation tag collar surrounds the aviation tag to protect it from rain, wind and snow.How to Measure Your Dog - To determine the size you need, wrap a flexible measuring tape around the widest part of your dog's neck. Allow a two-finger gap when measuring to ensure a comfortable fit for our Air Tag Collar Holder.SIZE GUIDE - Our small adjustable collar fits dogs with neck sizes between 10.0 - 13.0 inches. Our gas mark pet collars are available in small, medium and large sizes to fit most dogs.Tamaño:S: length 36 cm, length 24-32 cm and length 2-5 kgM: length 51 cm, length 32-45 cm, length 6-15 kgL: length 66 cm, length 42-60 cm and length 16-30 kgPackage contains: 1 × pet positioning collar (airtag not included)Color: brown, black, pink, blue