The Troy-Bilt JumpStart Engine Starter eliminates the need to 'pull-start' most of the newer Troy-Bilt gas-powered lawn tools (e.g., trimmer, edger, blower, aerator/cultivator). It's especially useful in situations where the tool has not been started for a long time or its engine is cold. To operate, the device is inserted into the tool's 'starter port,' is switch-activated, then immediately disconnected from the port. Three models are available-cordless lithium ion battery-powered, corded electric-powered, and drill-powered. Any of the three can be used to start a JumpStart-capable Troy-Bilt product.