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==Hardware==
===Display and SoundReview==='''Display''': The smartglass [[head-mounted display]] requires neither cords nor phones. It features a HD 3D [[optical head-mounted display]], spatial sound system along with various sensors. The eye-piece consist of a tinted visor with a pair of combiner lenses within. 2 small speakers are located on the sides of OHMD. Unlike headphones, these speakers do not prevent the user from hearing external sound.
The [[field of view]] where the holograms appear is quite small, 30° Horizontal and 17.5° Vertical. It is the same as a 16:9 monitor with 15 feet diagonal, 2 feet away from you face.
Sensors include head tracking [[IMU]]s, sound capture system consist of an array of 4 microphones, an energy efficient depth camera with 120°×120° [[FOV]], a 2-megapixel RGB video camera and an ambient light sesnor. Additionally, it has 4 environment sensing cameras that work with the depth camera to
For processors, in addition to [[CPU]] and [[GPU]], HoloLens will possess an [[HPU]], [[holographic processing unit]]. HPU is a coprocessor that is dedicated to integrating real world and virtually generated content. It consolidates and processes all the data from various sensors and produces a thin stream of useful information to the other processors. HPU removes the burden of handling heavy external data from the CPU and GPU, allowing them to focus on creating content.
[[HPU]] - processes all of the data from its sensors, depth camera, microphone etc.
A pair of buttons responsible for brightness is above the left ear while another pair of buttons responsible for volume is above the right ear. In each pair, one of the buttons is concave while the other one is convex.
5 LEDs are present on the left side of the OHMD. These LEDs display various system statuses such as power and battery conditions. A microUSB port is present for charging and connection.
Battery in HoloLens lasts around 2.5 hours during processor intensive use. It lasts around 5.5 hours during regular use.
