The PowerWatch 2, a smartwatch that draws enough body heat to never need recharging, is officially on sale in the US and UK – and it’s shipping out to folks who preordered.

The smartwatch – or more accurately, a robust fitness watch – is available on the PowerWatch online store. The standard PowerWatch Series 2 comes in a black steel finish with silicone strap and costs $499 / £499, while the Series 2 Premium with silver finish and stainless steel bracelet runs $599 / £599. At the top of the list is the Series 2 Luxe, which packs a titanium finish and stainless steel milanese bracelet for $699 / £699.