AT&T ATT 993 - Manual (Page 76)

73
Appendix
Technical specifications
Operating temperature: 32°F — 22°F
(0°C — 50°C)
Power adapter input: AC 20V 60Hz
Power adapter output: AC 9V, 300mA
Backup battery:
Alkaline 9V
Headset jack:
2.5mm, 32-50 ohm