Expanding Your Phone
Ten Handset Expandability
Your phone supports up to ten handsets, including any handsets supplied with your phone. You can place a fully-featured cordless handset anywhere power is available to connect the handset charger. All the registered handsets ring when a call is received.
Your phone is compatible with a variety of handsets, including the TCX805, TCX905, ELX500, TCX400, TCX440 and TCX450. (Please check www.uniden.com for an updated list of expansion handsets compatible with this series.)
Registering Expansion Handsets
If you purchase an expansion handset, you need to register the handset before use. Only one handset can be registered at a time.
Handsets supplied with the phone are registered to the base by the factory. When you register an extra handset to the base, the handset ID will be assigned.
Before the expansion handset is registered, the battery pack MUST be charged for 15-20 hours.
To register TCX805 and TCX905 handsets
Make sure the base is in standby mode
Place the handset in the main base.
While the handset is registering, Handset Registering will appear in the LCD. When Registration Complete is displayed, the handset has been registered to the base. If Registration Failed appears, please try these steps again.
EXPANDING YOUR PHONE 
EXPANDING YOUR PHONE