Features: Dedicated to receiving calls between aircraft and tower. Open area can receive all kinds of communication between aircraft and tower within 150km. Receiving frequency covers: 118-136mhz With LED tuning indication function, it can help to adjust the receiving frequency accurately and quickly. The first and second intermediate frequency circuits all use ceramic filters, which greatly reduces the difficulty of amateur debugging. Specifications: Size: Package(15.5x10x5cm/6.10x3.94x1.97inches) Note: You can buy the parts that need DIY, or you can buy the whole set directly. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Package includes: 1 Set R80 Receiver