VLN=3.3...4.1 V (IL=15 mA) VLN=11.0... 15.0 V (IL=100mA)
7 Capacitors & Resistors
Low Voltage Operating
DTMF signal input with confidence tone Mute input for DTMF dialing

Line loss compensation (line current dependent) for microphone and earpiece amplifiers

Gain control curve adaptable to exchange supply DC line voltage adjustment facility