Paradox SP65 alarm control panel features:

Supports StayD mode
4-wire expansion bus
Expandable to 32 zones
Expandable to 16 PGMs
2 Partitions
32 User Codes
Supports PCS Series
Supports IP100 Internet Module
Supports VDMP3 Plug-in voice dialer
Supports REM3 hand-held remote keypad - require RTX3 V1.31 or higher (SP4000 - One way only)
PA5171