I have the GM one, it is a battery charger with alligator clips. I bought a Battery Tender at Costco so I could hardwire it to my battery and plug it in with the pigtail connector. Save your money and buy a retail one. If you plan to let your ZL1 sit for more than a month at a time, you will need to keep it on a charger of some kind.
https://www.costco.com/Battery-Tende...100241973.html