WSPRlite CLASSIC - HAM RADIO/AMATEUR RADIO - $99 (POULSBO)

This now rare, incredibly small, 200 mW portable WSPR transmitter, which can be powered from a 5 volt DC battery, transmits on 160 meters through 20 meters.
A built-in low pass filter is included for operation on 30 meters and 20 meters.
Windows desktop software and an Android app connect to the WSPRlite to program your call sign, grid square, band selection, and output power.
Thorough reviews of the WSPRlite can be found at pages 47-50 of the December 2018 issue of QST magazine and at pages 42-44 of the June 2017 issue of RadCom magazine of the Radio Society of Great Britain.
Can ship within the USA, at your cost, via USPS Priority Mail.