New Panasonic KX-DT321, KX-DT333, KX-DT343, KX-DT346,  and KX-DT390  phones are used  with Panasonic KX-TDA50,  KX-TDA50-G, KX-TDA100,  KX-TDA200, KX-TDE100, KX-TDE200. They are not compatible with the KX-TA824 or KX-TA1232 phone systems.

KX-DT333-B 24 Button Digital Display Speakerphone: 3-line x 24 character LCD with, 24 programmable CO keys with dual color LED, Navigator key, Hands-free Speakerphone (full duplex) Large message/ringing lamp (red/green), Large message/ringing lamp (red/green), Headset jack, XDP/DXDP Jack for adding another KX-DT300 DPITS or SLT extension.

KX-DT343-B 24 Button Digital Backlit Display Speakerphone: 3-Line x 24 character LCD with back-light, 24 programmable CO keys with dual color LED, Navigator key, Hands-free speakerphone (full duplex), Large message/ringing lamp (red/green), Headset Jack, compatible with optional 12-CO keys interface interface (KX-T7603). XDP/DXDP Jack for adding another KX-T7600 DPITS or SLT extension.

KX-DT346-B 24 Button Digital Display Speakerphone:

6-line x 24 character Caller ID LCD with back-light, 24 programmable CO keys with dual color LED, Navigator key, Hands-free speakerphone (full duplex), Large message/ringing lamp (red/green), Headset jack compatible with optional USB port (KX-T7601) and optional 12-CO keys interface (KX-T603) XDP/DXDP Jack for adding another KX-T7600 DPITS or SLT extension.

KX-DT390-B 60 Button DSS: 60 Direct station selection (DSS) busy lamp field (BLF), Wall mountable physically attached to digital system telephone by a screw, (A DSS Console requires 1 digital system telephone extension port, No restrictions for programmable flex keys, for all 7600 series models