Technical information, Maintenance, Wall mounting – BT 90 User Manual
Page 34
Technical information
25
Call security
25
Connecting to a switchboard
27
Connection information
27
REN (Ringer Equivalence Number)
26
Safety advice
26
Transmission frequencies
26
Maintenance
28
Changing handset battery pack
28
Care of handset battery pack
29
General cleaning
29
Guarantee
30
Installing handset battery pack
28
Power failure
29
Wall mounting
33
Index
32
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