Selta Zenyth 650 - Two-Way Speaker Phone Operation; Speaker Mode Activation

8.4 Two-way speaker phone operation
8.4.1 Speaker mode
To make a call, press SPEAKER key to activate the speaker phone. Press
SPEAKER key to deactivate the speaker phone when the call is over.
8.4.2 Speaker volume control
To change the speaker volume, press VOL key to adjust the volume levels
during off-hook state.
9 . Technical Characteristics
Size: (without phone base support)
Depth 21,4 cm
Width 16,0 cm
Height 3,5 cm
Weight: 0,7 Kg
Operating range:
Temperature 5°C - 40°C
humidity 95% RH max,
without condensation
DTMF dialling
Duration 100 ms
Pause 100 ms
Calibrated break: 97 ms +/-4ms
(flash key)
Wall mounting: arranged