Features: Signal Boosters antenna, which can improve the antenna signal and extend the remote controlled distance. Good directionality and certain interferences resistance ability, flying more. It can make signal strong and more stable, helping reduce the drones crash chance and other accidentials. Quality materials, anodizing treatments, enhances the texture, wear-resistance and corrosion resistance for reliable use. Easy to installation and remove, insert and use, without worrying about damaging the remote. Specifications: Material: Brass+Aluminum+Plastic Size: about 5x5.2x4.4cm/1.96x2.04x1.73inch Applicable Model: for Air 3/Mini 4 Pro Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1 Pair Yagi Antenna