Secondly, featured on all models from the Raspberry Pi 2 onwards, is the "ACT" light. You may also see this light labeled "OK", but both indicate the same functionality and are green when lit.

Today, Raspberry Pi founder Eben Upton announced the Raspberry Pi Zero 2 W, a new $15 product that puts the processor from the Raspberry Pi 3 into a board the exact same size as the original Zero.