In computing, a system call is the programmatic way in which a computer program requests a service from the kernel of the operating system it is executed on. This may include hardware-related services (for example, accessing a hard disk drive), creation and execution of new processes, and communication with integral kernel services such as process scheduling. System calls provide an essential interface between a process and the operating system.
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Intercom Window Counter Dual Way Interphone System F4455A
This system has top-quality speaker and high-sensitive microphone. Especially using a 4 core high-strength aluminum foil shielded wire, strong anti-interference ability, which makes the voice clear and natural. The two-way voice intercom communications technology, automatic identification of processing speech signals during a call does not require any action
140,00$ -
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HappyCall HC-402R
The receiving device of the wireless call system.
525,00$HappyCall HC-402R
525,00$