The Board was very poorly packaged and arrived damaged. I had to solder the board back together to fix it. I additionally found that the board still draws power from the battery if nothing is turned on.
All is ok. Modul work well. Self consuption.....Relay OFF=16mA, Relay ON=62mA (cca 20v Input Voltage). I am very satisfied. For Czech: Doporučuji pro všechny, kteří nechtějí "oddělat" svůj zdroj (baterku) podvybitím.