If so then the difference is the DSE901 can be recharged and used many times over. At least that's the impression I get from looking at the M901 I don't think it said anything about a charger.
The M9 and M901 is pretty much the same. Possibly only difference is in its packaging. The M9 is a disposable. The battery cannot be recharged. Hence, the price is usually much cheaper.
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