Series 2 (VQ21) Body Style A (Single Unit) Coil Voltage 5 (24VDC) Lead Wire YO (DIN Terminal w/o Connector) Voltage Protection None (Or w/Surge Suppressor in Case of AC Volts) Manual Override None Port Size C8 (8 One-touch Fitting) Option L Type (VQ21 Only) Q Q (CE Marked)