A:AnswerDear customer, thank you for your question. This handset is not compatible with your unit. The compatible handsets are the following ones: KX-TGEA40, KX-TGMA44, KX-TGFA30, KX-TGHA20, KX-TGA410, KX-TGA651, KX-TGA806C.
A:AnswerThank you for your question. Both of the units are handsets. Handsets are compatible with base units, therefore 2 handests can be compatbile with each other if they are also compatible with a specific base unit.
A:AnswerThank you for your question. In order to better assist you we would need the model of the base unit as the handsets are compatible with the base unit. 2 Handsets cannot be compatible with each other just if they're both compatible with the base unit. Please see below the compatibility list: http://eng-ca.faq.panasonic.com/app/answers/detail/a_id/57170/kw/compatible/p/7/c/67659