If you need some help, call us on 0800 218 2182* or go to bt.com/producthelp
64 General information
Important
You won’t be able to call 999 from this phone if there’s
a power cut, so make sure you’ve got another way to
call for help in an emergency.
This product is intended for connection to analogue
public switched telephone networks and private
switchboards in the United Kingdom.
Replacing the handset batteries
After a time, you might find that the handset batteries
run out of charge more quickly. This is a standard sign
of wear and the batteries will need replacing.
1. Open the battery compartment cover.
2. Lift the battery out and remove the batteries.
Replace with two new AAA Ni-MH 500mAh
rechargeable batteries.
3. Replace the battery compartment cover.
Battery
Manufacturer Model Rating
Corun NI-MHAAAJ500 500mAh
GPI VT50AAAHC 500mAh
Caution
Don’t immerse batteries in water, throw them into a fire
or dispose of them with ordinary domestic refuse.
BT accepts no responsibility for damage caused to your
BT3920 by using any other types of batteries.
There is a risk of explosion if incorrect batteries are fitted.
Safety information
• Only use the power supply suitable for the BT3920.
Using an unauthorised power supply will invalidate
your guarantee and may damage the phone. The item
code for the base mains power supply is 066773 . If
you’ve bought a multiple pack, the item code for the
charger mains power supply is 066773.
• Use only the approved rechargeable batteries supplied.
Spare rechargeable batteries are available from the
BT3920 Helpline on 0800 218 2182*.
• Don’t open the handset (except to replace the
handset batteries) or the base. This could expose you
to high voltages or other risks. Contact the Helpline
on 0800 218 2182* for all repairs.
• If the keypad is locked, it is still possible to make
calls, to 999 and 112 emergency numbers.
• Radio signal transmitted between the handset and
base may cause interference to hearing aids.
• It is recommended that advice from a qualified
expert be sought before using this product in
the vicinity of emergency/intensive care medical
equipment.
• It is recommended that if you have a pacemaker
fitted you check with a medical expert before using
this product.
• Your product may interfere with other electrical
equipment, e.g. TV and radio sets, clock/alarms and
computers if placed too close.
• It is recommended that you place your product
at least one metre away from such appliances to
minimise any risk of interference.
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