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The Oticon Alta2 Pro was offered in the following behind-the-ear form factors (or styles):
Each of the styles is slightly different. Some are smaller, some are larger, some offer more manual control (push button and/or volume control), some offer a telecoil, some offer FM compatibility, but all are based on the same Inium Sense platform for audio processing. See the product brochure (PDF download) for pictures and more information about each style.
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