Features: High loud 100dB alarm buzzer with synchronized flashing LED ensures easy visibility and alerts for remote control models, compatible with BF/CF flight controllers. Use plastic material integrates seamlessly into drones and remote control vehicle without added bulk, featured tool freely installation and universal voltageS adaptability. Essential for drones racers, hobby engineers, and remote control enthusiasts requiring immediate auditory visual feedback during high speed maneuvers. Great for tracking aircraft orientation in competition, monitoring boat signal at lakes, or enhancing safety during low light FPV flight. Water resistant housing and wire connectivity ensure great performances across helicopters, multirotors, and surfaces controlled model. Specifications: Component: Plastic Size: 18x17x15mm/0.71x0.67x0.59inch Tip: Method to turn off the buzzer: Hold down release key for more than 2 seconds to turn off the sound. Charging Mode: Red LED on indicates that charging is in progress, and red lights off indicates that charging is full. The flashing red lights indicates that the flight control power off and entered a 30-second waiting period Package Includes: 1PC LED Warning Buzzer note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.