SILENT KNIGHT SK 5820XL. Replacement Board Only. Works. Tested. Version 12 This version can works with SD devices( HOCHIKI) and SK devices. Key not included.

Will refund 350 if send Us your old unit.

TESTED.

Sk and SD SLC.

6. NAC

6 24v output

S. BUS

3. Relays

Phone lines

Dialer

Ground fault

Upload/download

All working properly.

If return no refund on shipping cost. Thanks you for looking.