Features: Aviation frequency Converters, aviation frequency conversion to shortwaves, 2 in 1 aviation frequency Converters highly resistance amplifier. It is possible to downconvert the aviation frequency bands from 118MHz to 138MHz to cover the received SW shortwaved bands with a regular radio, easy for regular radio to achieve aviation frequency reception. Support the conversion between highly impedances converters and aviation frequency converters. It can achieve better pairing and working with magnetic rod, etc improving reception performances. Small size with build-in 700mAh battery and USB C interfaces charging, it is essential tool for home travel, listen to radio, and more! Used for highly resistance amplifier function, it can last for 60 hours, and used for aviation frequency converters, it can last for 23 hours Specifications: Type: 100M, 110M(optional) Size: about 4.5x4.8x1.9cm/1.77x1.89x0.75inch Package Includes: 1x 2-in-1 Aviation Converters Highly Resistance Amplifier with Cable Kit note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.