Sorry, but one of 3 units was broken.... It has yellow tape over the 7 segment display, probably NOK @ QC... I managed to repair the unit. Bad soldering of the power supply... As result i rechecked some other broken units i still had in stock. And i managed to repair them all :-) All had the same soldering problem.... Please check production ;-)
One of 3 broken, but after re soldering the power supply the unit works.