According to the latest news, Xiaomi 7 will be officially released at the end of May. In addition, we also learned some about the characteristics of this machine.
From the latest exposure of the tempered film, the "Liu Hai" of Xiaomi 7 is indeed much wider than the Huawei P20, OPPO R15, and vivo X21 equivalent design products, quite close to the iPhone X, and the number of components such as the camera is also relatively large. Using 3D structured light face recognition, this is likely to be the first in China.
In addition, from the latest exposure of the transparent soft shell of Xiaomi 7, the back of the Xiaomi 7 still uses a family-like "traffic light" dual camera shape, and has a certain convexity. But apart from this, there are no other openings in the back, which also indicates that Xiaomi 7 is unlikely to use back fingerprint recognition. There is no front fingerprint on the front side, no back fingerprint on the back, and no scanning area on the side, indicating that Xiaomi 7 is likely to use the fingerprint on the screen.
According to the previous exposure, Xiaomi 7 can be said to have used more than ten black technologies, screen fingerprints, Samsung OLED Liu Haiping, wireless charging, Xiaolong 845, face recognition and so on. Of course, these costs are very high, so the price of Xiaomi 7 has risen accordingly.
With so many new technologies in one, and for now, it is still difficult to fully mass-produce the fingerprints on the screen. When you want to buy Xiaomi 7, you still have to buy it.
A siren is a loud noise-making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire trucks. There are two general types: pneumatic and electronic.
Many fire sirens (used for calling the volunteer fire fighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire
sirens are either mounted on the roof of a fire station or on a pole
next to the fire station. Fire sirens can also be mounted on or near
government buildings, on tall structures such as water towers,
as well as in systems where several sirens are distributed around a
town for better sound coverage. Most fire sirens are single tone and
mechanically driven by electric motors with a rotor attached to the
shaft. Some newer sirens are electronically driven speakers.
Fire sirens are often called "fire whistles", "fire alarms", or
"fire horns". Although there is no standard signaling of fire sirens,
some utilize codes to inform firefighters of the location of the fire.
Civil defense sirens also used as fire sirens often can produce an
alternating "hi-lo" signal (similar to emergency vehicles in many
European countries) as the fire signal, or a slow wail (typically 3x) as
to not confuse the public with the standard civil defense signals of
alert (steady tone) and attack (fast wavering tone). Fire sirens are
often tested once a day at noon and are also called "noon sirens" or
"noon whistles".
The first emergency vehicles relied on a bell. Then in the 70s,
they switched to a duotone airhorn. Then in the 80s, that was overtaken
by an electronic wail.
Piezo Alarm,Siren And Alarm,Piezo Buzzer Siren,Piezo Buzzer Alarm Siren
Jiangsu Huawha Electronices Co.,Ltd , https://www.hnbuzzer.com