XT30/ XT60 Model airplane ,Every quad/drone owner should have one. A smoke stopper can help avoid damage when you power on a mini quad drone for the first time. Sometimes you might have a defective part or a short somewhere, the smoke stopper can limit the current flow and prevent "magic smoke"It saves your electronic components from current surges, and gives you a chance to troubleshoot the failure without having to replace the burnt-out parts. The LED indicator turns solid green in normal situation The LED indicator turns off and starts beeping in abnormal Colour:As Shown Material:PCB Package Contents: 1 * Model airplane Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.