Features Enhanced Reception: Perfectly match and work with various antennas such as ferrite rods, passive small loop antennas, antennas, and more to improve reception quality. Wide Frequency Coverage: Easily receive aviation band signs by converting 118 to 138MHz to the SW shortwave band, expanding the capabilities of your regular radio receiver. Seamless Compatibility: Effortlessly switch between high impedance converters and aviation frequency converters for optimal sign reception. Portable and Convenient: Compact design with a built in 700mAh battery and USB C charging port makes this frequency converter necessary for home, travel, and radio listening on the go. Improved Antenna Matching: Achieve high impedance antenna input matching for devices with peacock stone or standard 50 ohm inputs, enhancing sign reception. Spec: Item Type: AIR to AM HIZ AMP Frequency Converter Material: Aluminum Alloy Battery: Battery x 1 Battery Capacity: 700mAh (shipped with built in battery) AIR to AM+HIZ AMP (1k-150m) How to Use: Connect and start using PackageList: 1 x AIR to AM HIZ AMP Frequency Converter 1 x USB Cable Package List 1 x AIR to AM HIZ AMP Frequency Converter 1 x USB Cable