![](http://pdfasset.owneriq.net/a/38/a384831c-91a9-b174-c9a8-5200af841785/a384831c-91a9-b174-c9a8-5200af841785-bg4c.png)
99
Appendix I
Technical specification
Operating temperature 32°F — 122°F
0°C — 50°C
Power adapter input AC120V 60Hz
Power adapter
output
DC12V 500mA
Backup battery
(purchased separately)
Alkaline 9V, size 1604A
Headset jack 2.5mm, 32 - 150ohm
Wiring limitation No more than 600 feet
REN 0.3B
System signal carrier
frequency
1.7 MHz