Since about 1410z, I have been on WSPR TX with my little W5OLF 10m WSPR beacon. As mentioned before, this is about the size of a pack of cards and is totally self contained. No PC is needed. Time is synchronised with a button push, then it TXs 100%, but randomly changes frequency within the WSPR window every 2 minutes.
UPDATE 1455z: 8 unique reports with the furthermost by EA8BFK (2880km) in the Canary Islands.
UPDATE 1840z: 14 unique stations have spotted my 500mW 10m WSPR beacon today.