Effectively manages power to stable and prolongs service life of FPV flying glasses. The power management module is highly versatile and easy to install. The integrated belt clip can be easily installed on all types of FPV flying goggles. The power supply range is 2-4S and is suitable for more than 90% of FPV flying goggles currently on the market. Used on Fatshark's full range of for FPV Goggles, it can detect and grasp battery status at any time, and can set low-voltage alarms. Equipped with power management function, it can regulate power output to protect device from overloads shortcircuits. Stable power output ensures that for FPV flying glasses work stably and not affectedd by Voltages fluctuations. Function: 1. Provide a main power switch for FPV flying goggles. 2. Real-time digital display of battery voltage. 3. The battery low voltage alarm can be customized with a button (similar to the sound of a model aircraft). 4. Provide a standard Fat Glasses fan power interface, (note: this interface is the total battery voltage output, for FatShark Glasses power supply range standard is 2-3S, Fat Glasses can only use 2-3S batteries). Colour:Black Material:PCB+electronic components Package Contents: 1 * Power Management Module 2 * cable 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.