MAX & MOLLY Playtime 2.0 Smart ID Dog Collar for Small Dogs is a standard dog collar that comes with a safety Smart ID Tag that features a unique QR code. To activate the tag, simply download the Max & Molly App and scan the code. The adjustable collar is made from durable exterior polyester and quick-drying neoprene material, with soft padding inside to ensure your pup's comfort. It's available in different sizes, so you can find the perfect fit for your pooch.