A:AnswerThe KX-TG4021 is compatible with several handset model numbers. These handsets include the Panasonic KX-TGA401, KX-TGA651, and the KX-TGA750. You can have up to 6 total handsets registered to the main base. -AM
A:AnswerHi Ken, this is an expandable handset that is part of the phone system KX-TG6411. The handset will not work without the main system. This model does not offer Talking Caller ID. A.E
A:AnswerThe KX-TGA641T handset is compatible with the KX-TG6400 model series. The KX-TG6431T includes one handset which settles on the base and the KX-TG6432T comes with 2 cordless handsets.