[1] With it, it is possible to downconvert the 118MHz to 138MHz aviation band to a regular radio, which can cover the received SW shortwave band. So that ordinary radios can easily achieve aviation band reception. [2] High resistance amplifier It can achieve good matching and operation with magnetic rods, passive small loop antennas, rod/whip antennas, and other antennas. Improve reception performance. Can achieve high impedance antenna input matching for first generation malachite or standard 50 ohm input receivers and handheld devices. Compact and portable, with a built-in 700mAh battery and a USB-C port for charging. Wide coverage, can achieve frequency conversion from 118M-138M to 8M-28MHz, and the vast majority of shortwave radios can cover frequency gain: Approximately 10dB. HiZ amplification frequency: 1khz-150MHz Battery capacity : 700mAh charging time : about 2 hours Colour: Black Material: Aluminum Alloy Package Contents: 1* frequency converter (Due to different product batches, the appearance , which does not affect the use) 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.