Technical specification – AT&T 1040 User Manual
Page 64
58
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
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