Snaps in seconds and easy to see as red in color. Adjustable length snaps in the seat belt receptacle and the other end snaps to your own harness or dog collar. Every day a pet goes missing when in an accident. While first responders attend to you the pet goes missing or is injured or killed. Protect your furry family member . One for each let and one for each vehicle is best as you can leave them attached and simply snap in seconds. Brand new in packages.