Through the use of high-gain antennas, the device can achieve transmission distances of 10 to 15 kilometers in open urban areas, and up to 50 kilometers in air-to-ground line-of-sight (LOS) conditions. This high-gain antenna can significantly improve the transmission ability of the signal, especially in the case of line-of-sight transmission, can concentrate the signal energy in a specific direction, thereby increasing the transmission distance. However, it is important to note that the transmission distance vary depending on the environment, for example, in an urban environment, the actual transmission distance may be affected due to buildings and other obstructions. Specification:VRX Product:Analog video receiver Voltage:DC 10V-18V Modulation:FM Frequency:300Mhz Frequency band:300Mhz 320Mhz 360Mhz 380Mhz Video Output:1 -p(FM) Temperature:-10 - +50 Antenna port:SMAfemale (The product appearance and printed words depending on the batch, but this does not affect use) Color: As shown Material: Metal Package Contents: 1 x 1.2Ghz Video Transmitter 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.