KS220-S have 2 relays, the power supply is DC12V.
Have three relay mode:jog mode, self-locking mode, ignition mode.
Helpful hints:
If need to connect with car,motorcycle, and needs high security product,suggest to chose R503,R502-F.
The difference between KS220-S and KS220-L:
KS220-S: DC12V, 25uA
KS220-L: DC30-75V, 3.5mA