This is a useful connected lead to connect Keis (5.5 x 2.1) to the Industry Standard Connectors (5.5 to 2.5), used by Warm & Safe, Gerbing etc I use a Warm & Safe (USA) Power Connector on my Motorcycle Battery with my Warm & Safe Heated Jacket. I also have a Keis Heated Jacket and a Keis Heated Vest. When I am using the Keis Heated Clothing, I use this adapter to connect it to my Warm & Safe Power Lead. The Lead works just fine