Introducing the Cooling System for DJI Transmission.The cooling system mounts to the DJI Wireless Video Transmitter or Receiver using four M4 screws and spans 78x60mm which aligns precisely with the hottest area of the unit for efficient heat dissipation.This accessory utilizes semiconductor cooling which was designed with a precise layered structure and high quality semiconductor materials.The unit can be powered via the USB-C Port on the Transmitter/Receiver Unit itself, or it can be powered externally via an NPF Battery Plate or an External Battery Bank with PD USB-C.Semiconductor CoolingDesigned with a precise six-layer structure and high-quality semiconductor materials, the unit features a 50 x50mm cooling chip, significantly improving the cooling efficiency.Full Coverage For Fast CoolingThe cooling system is mounted using four M4 screws and spans 78 x60mm, aligning precisely with the hottest area of the unit for efficient heat dissipation.Dual-Speed AdjustmentThe cooling system can be adjusted between low and high speeds using the dial on the left side.Performance TestTest conditions: 30 Degree C, control mode linked to a single device, 35m transmission range, with wall barriers.Multiple Power Supply ModesMain Power Mode: Powered by the Transmission DevicePower is supplied from the USB-C port on the transmission device, and connects to the USB-C port on the cooling system.