Description:
Adapter unit, compatible with Sony MZ-R30, MZ-R55, or equivalent. Includes two low-noise microphone amplifiers, PPM meters, lead-acid battery, monitor speaker, headphones amplifier. Housed in all-metal case for external electromagnetic noise shielding.
Links:
Marenius has an English page for this unit.
they have designed (and its insides), it is available from
Marenius in Sweden (price?).