KT-4077 is the US export model of KT-GS5, KT-V770 the EU model. It came in black only, while KT-GS5 came in white, black and red.
KT-AS2 succeeds KT-AS1: KT-AS2 has only one headphone jack and the tuner cards are different. ≡
The KT-S3 was the 3rd in the KT-S series. It could be equipped with tuner pack RP-S2 for FM radio reception. ≡