技术参数：
1. Number of Rings Before Answer:
1 to 8
2. Automatic Time Out:
1 minute with no or incorrect activities
3. Access Code Selection:
Any three (3) numerical digits
4. Alert Duration:
15 Minutes to 24 Hours
5. Number of FIPS Codes:
Nine (9) maximum
6. External Switching:
Two (2) SPDT relays (SW1 & SW2)
2 Amp 30V DC non-inductive loads
7. Indicator Lights:
One (1) to indicate “TELEPHONE
OFF HOOK”
8. Maximum Message Length:
60 Seconds
9. Power Requirements:
+12V DC; 94-240 VAC wall unit supplied
10. Physical Size:
6½” x 4¼” x 2”
11. Weight:
2 lbs.