20m WSPR buoy

Some weeks ago a High School group in the USA launched a marine buoy with a 20m WSPR beacon on board. It moves with ocean currents.

I am not sure if it has been copied in Europe or what power it runs. It is in the Pacific Ocean off California.

It can be tracked using https://aprs.fi/#!call=a%2FKQ6RS-1&others=1&timerange=604800&tail=3600