As of June 25th, 2021, McVac Manufacturing will be changing the enclosure for P/N 900-004 Remote Oscillator. This is the same enclosure that we had been using for our oscillator prior to 2016. This enclosure is more robust, and allows for more functional stability, which will decrease the chances of premature failure. The functionality of the oscillator remains the same, and the only change is the enclosure itself. If you should have any questions, please reach out to email@example.com, or firstname.lastname@example.org, and we will be happy to assist you.