What do the indicator lights mean on USB Block Erupter ASICs? The lights on USB Block Erupters stay solid when not mining. During mining, there will be frequent tiny flashes, and occasionally longer flashes, lasting a few seconds. What exactly are do the short and long flashes indicate?
A steady light means no connection to the server delivering work, a short blip means the device has found a difficulty one share for submission. At the current time submitting a single difficulty one share is worth about about 0.000000035 BTC.