These printers use the KX-FA83 cartridge:

Panasonic KX-FL 511

Panasonic KX-FL 512

Panasonic KX-FL 513

Panasonic KX-FL 540

Panasonic KX-FL 541

Panasonic KX-FL 542

Panasonic KX-FL 543

Panasonic KX-FL 611

Panasonic KX-FL 612

Panasonic KX-FL 613

Panasonic KX FLM 651

Panasonic KX FLM 661

Panasonic KX FLM 671