UCOTECH's stainless steel in-ear (earphone) earphone "IL300-Affetto" will be released in Japan on August 22. The price is around 23,800 yen (including tax), which is about RMB 1,435. The headphones are available in silver and brown.
This in-ear headphones, named after the word "Affetto" in Italian. The lens body is coated to prevent fingerprints, scratches, etc. caused by hand touch. Through double coating (PVD + fingerprint prevention coating), even sensitive skin users can use it without worry, taking care of all kinds of people. On the core, noise is also minimized through the endpoints.
The unit of the earphone is a dynamic unit of 8 mm diameter. The impedance is 16Ω and the sensitivity is 105dB. The number of regenerative cycles is 20 Hz to 40 kHz. Maximum 30 mW input. The cable length is 1.2m. Weighs about 12 grams.
A port is an interface through which data is transferred between a computer and other devices (such as printers, mice, keyboards or monitors), networks, or other directly connected computers.
For the CPU, the port is used as one or more memory addresses for sending or receiving data. Dedicated hardware, such as an additional circuit board, places the data from the device in a memory address, and sends the data from the memory address to the device. Ports can be dedicated for input and output only. The port usually receives a specific type of plug for a specific purpose. For example, serial data interfaces, keyboards, and high-speed network ports all use different connectors, so it is impossible to plug the cable into the wrong port.
In programming, a port is a "logical connection location", especially in the Internet Protocol TCP/IP, a way for the client program to be assigned to a special service program on the computer. High-level applications that use TCP/IP protocols such as web protocol and hypertext transfer protocol have specially designated ports. From the perspective of port allocation, ports are divided into two categories: fixed ports and dynamic ports: Fixed ports (0~1023): use a centralized management mechanism, that is, subject to the assignment of ports by a management organization, which is responsible for issuing these assignments . Because these ports are closely tied to some services, we will often scan these ports to determine whether the other party has enabled these services, such as TCP 21 (ftp), 80 (http), 139 (netbios), UDP 7 (echo), 69 (tftp) and other well-known ports; Dynamic ports (1024~49151): These ports are not fixedly bound to a certain service. The operating system dynamically allocates these ports to each process, and the same process is allocated twice It is possible to assign to different ports. However, some applications are reluctant to use the dynamic ports allocated by the operating system. They have their own "branded" ports, such as port 4000 of the oicq client and port 7626 of the Trojan Binghe, which are all fixed and famous.
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