Sony announced a pair of entry lever IC Recorders with the AX412F recording and playing Mp3 Files, with 2GB of internal memory and both microSD and M2 Support. IC Recorder AX412F also include a Stereo Mic, FM Radio and Radio recoding mode as well as several other audio and recording modes as well as features.
The BX312 in the other hands come with a Mono Mic only and not FM Radio Tuner and Radio recording mode.
Via: Sony
