4x2+2 zones,4 double zones input,2 zones in keypad 636 keypad and 646 keypad optional, supports up to 5 units keypads Instant arming, time delay arming, out arming, home arming and bypass defense zone programmable Supports preserved 2 groups telephone numbers 48 user codes+1 master code+1 installation code 1 PGM output (N/O,N/C output max currency:50mA) Alarm bell output,auxilary output and telephone line protected 2 partitions Anti-tamper display for defense zones 256 events buffered Ademco Contact ID Power supply: AC 16.5V,3A,50-60Hz Currency: 4W (340mA). Standard package.