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Details from the listing:
Custom-built Multibank RAM Cartridge with 16 banks for the storage of sound patches and performances. So it's essentially 16 (or 8 or 4*) cards in 1 !
Compatible with Waldorf Microwave Mk1, and all synths etc. that use the Bee-Card type cards. (01/W, Wavestation Series, M and T Series, DS8, 707, A1-A2-A3 FX processors....)
NOTE 1: Korg MCR-03 is in fact identical, it's only a name re-brand by Korg after adopting the Bee-card cartridge format, for use in their equipment.
NOTE 2: Can be configured as either 16 banks x 32 kB, 8 banks x 64 kB, or 4 x 128 kB card. 16 x 32 kB is most common, but please specify the required format upon ordering. Thank you!
Bank selection rotary switch, back-up battery with a life span of 40+ years (Yes, those modern memory chips really are a LOT more energy efficiƫnt than those old ones! ;-) "