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The M9 runs Android Lollipop with HTC's Sense 7 user interface and software suite. The built-in infrared (IR) sensor can make the device a remote control for other infrared-enabled gadgets. The M9's front-facing "BoomSound" stereo speakers now use Dolby Audio tuning. The speakers have been a prominent feature of the HTC One M series since the M7. Ģ160p videos are limited to six minutes per recording, after which the recording would need to be restarted. The UltraPixel image sensor (which had larger pixels in its sensor, but sacrificed megapixel size for enhanced low-light capabilities) was moved to the front-facing camera, with the rear-facing camera now using a more traditional 20 megapixel sensor, supporting 4K (2160p) video recording. Storage can be expanded with a Micro SD card up to 2 TB. The phone features an octa-core Qualcomm Snapdragon 810 system-on-chip with 3 GB of RAM, a 5-inch 1080p display, and 32 GB of internal storage (nearly 9 GB is reserved for the operating system). The HTC pro case, available separately, offers IP68-level water and dust protection, and a shockproof rating for up to a two-meter drop. The device has proper IPX3-level protection against spraying water. The design of the M9 is similar to its predecessor, except that it is slightly narrower and thicker.
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