Samsung recently released a wireless Bluetooth headset - Level U, with a new ergonomic design that not only listens to music, but also supports text-to-speech applications. Level U has a neckband attached to the traditional earbuds around the collar. Headphones. The whole machine weighs only 33 grams, while the neckband is equipped with adjustable joints made of soft polyurethane. The neckband has buttons on the side for controlling music playback, such as play/pause, volume, and skip. Comfortable The noise-reducing earplugs are magnetically attached to the neckband to prevent troublesome tangles when not in use. When not in use, Level U is connected via Bluetooth 4.1 to a smartphone or other mobile device.
In addition to listening to music, Level U headphones will of course allow users to handle hands-free calls. Level U has two microphones, one for capturing voice and the other for filtering out external noise. Level U also supports Android platform text-to-speech applications. Information such as notifications of missed calls, calendar events, alerts and remaining battery life, etc.:
Level U's battery life provides 10 hours of audio playback, 11 hours of talk time and 500 hours of standby time. Samsung website today began to sell Level U, priced at 69.99 US dollars, the appearance of color black / blue pure white to choose from.
Bi-Concave Lens
The double-concave lens is similar to the plano-concave lens. The focal length is negative, but the parallel incident light diverges outward. The two side surfaces of the double-concave lens have the same radius of curvature, and are generally used for beam expansion and projection.
The image formed by the biconcave lens is always smaller than the upright virtual image of the object. The biconcave lens is mainly used to correct myopia. Myopia is mainly due to the deformation of the lens, which causes the light to gather in front of the retina prematurely. The double-concave lens plays a role of diverging light. The double-concave lens becomes an upright, reduced virtual image, which makes the image distance longer and just falls on the retina.
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