Features: This Smokes stopper can help avoid damage when you power drones for the first time. XT30 & XT60 (Input and Output),suit for FPV Drones with XT30 or XT60 connectors. The LED indicator turns solid green in normal situation, The LED indicator turns and starts beeping in abnormal situation. It protects your electronic components from power surges and gives you the opportunity to fix the fault without having to replace the blown part. This essential tool lights up a green LED to indicate a secure connection, while preventing potential electrical hazards during inspections. Specifications: Type:XT30 XT60/XT90 XT30 XT60:Approx.4.2x3.2cm/1.65x1.26inch XT90:Approx.4.2x1.50cm/1.65x0.59inch Package Includes: 1Pc Smokes Stopper note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.