There are now Four variants.
Solarbuoy: For lack of a better name, it is a 200 watt solar powered electric motor self positioning buoy.
Sailbuoy: is a wind/electric driven solar powered self positioning buoy.
Wavebuoy :is a wave propelled autonomous vehicle. There is also an electric motor. IT is solar powered via 50 watt panel. Standard compliment of instruments
Drifterbuoy: Buoy is meant to be dropped by vessel into position. It will then drift with current. 20 to 25 watt solar panel. Standard compliment of instrucments