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Why do you need to get one?
Cameras such as the Rollei 35s, Rolleiflex SL35, Canonet QL17 GIII..etc. Cameras that requires the use of the PX625 Mercury type batteries. If you ever wondered why the exposure in your film is uneven and often under/over-exposed? The reason lies in the reading of your camera's metering manual/automatic while using the typical SR43 (Cheap Solution?).
No adjustment or modification to your camera is required. The MR-9 Adapter does not require activation or a supply of air. The MR-9 Adapter and silver oxide 386 cell has a significantly longer battery life than the zinc air WeinCELL MRB625 batteries. A worthy investment in the long run.