Sanyo SFX-110 Instruction Manual page 22

Tips for speaker key use
Adjust the Monitor volume control on the Ieft side of the unit toachieve the desired volume.
If both parties talk at the same time, some part of conversation may be lost.
If the speaker key is used in a noisy place, there may be momentary pauses in the
conversation.
To switch from the speaker key to the handset, simply lift the handset.
If you hear an incoming fax tone at step 1, the SFX-21 O receives the incoming fax
+mtomatically.
The power cord must be connected to an electrical outlet for telephone calls to be placed
from and received on the SFX-21 O.
If you make a mistake when dialing a telephone number, press [<-], and start over.