1) This machine should be installed at dry ventilate and solid indoor place (Temperature range: 0°C-45 C, humidity range: 20%-80%, avoid direct sunlight and combustible gas). Better use the special line to connect this machine

2) There must be some space at the bottom of this machine to ensure the heat elimination and system check and maintenance.

3) There are holes for wall mounting at the bottom, either to be hanged at wall or placed on table. The bolts for wall mounting should be avoid touching the inner circuit board.

4)Do not place this machine together with other equipment to produce big electromagnetism interface such as motor, large transformer and so on.

5)All extensions mustn’t be in the same piping with the power supply lines or antennae. Do not be near to the radio reception antenna including shortwave.

6)Do not destroy power supply cable. Avoid water spattering and rain. Immediately cut the power supply if there is water to enter.

7)Do not impact or shake this machine. Do not move it at random when used.

8)ll the extension line piping is interfered by electromagnetism wave and the channels cannot be changed due to the restriction on the spot, we suggest you to use the special insulation wire equipment for communication Digital
Intercom hub switching system.

9)High quality Eco Two way sound complete privacy.