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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Receiver / Display HappyCall HC-201R
Wireless device receiver.
265,00$ -
HappyCall HC-202R Receiver / Display
The receiving device of the wireless call system.
204,17$ -
HappyCall Receiver HC-208R
The receiving device of the wireless call system.162,00$HappyCall Receiver HC-208R
162,00$ -
Pager Text-Digital Gapollo AL-924
Portable text-digital mini-pager for sending messages over long distances
160,00$ -
Staff Pager DM-330p HappyCall
A pager for prompt service to visitors of cafes, restaurants, food courts, hotel guests, patients of private clinics and nursing homes, etc.
155,00$Staff Pager DM-330p HappyCall
155,00$ -
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$ -
HappyCall HC-400RT Signal Amplifier
Wireless device receiver.135,00$ -
Call Button HC-100T Happy Call
Wireless button. It has an original design and three colors. On the reverse side of the button is Velcro for fixing.
30,00$ -
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Call Button Happy Call HC-1400T
Wireless button. It has an original design and three colors. On the reverse side of the button is Velcro for fixing.23,00$