AT&T 929 - Manual (Page 18)

16
Technical specifications
REN 1.5B
Power
Line feed voltage 48V +/- 2V
Line loop current 18mA to 100mA
Ringer levels Off = 0dB
HI = 85dB
Compliance FCC and UL approved
Memory One-touch memory: 3 memory locations,
16 digits per location
Two-touch memory: 10 memory locations,
16 digits per location
Appendix
Three AA batteries are required for
backlighting of the
AUDIO ASSIST, MUTE
and lights. The telephone must also
be connected to a telephone line for all
features to work.