User Manual of DS-TRI4XX-X Series Bluetooth Card Reader
3
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Safety Instructions
Please adopt the power adapter which can meet the safety extra low voltage (SELV) standard.
To reduce the risk of fire or electrical shock, do not expose this product to rain or moisture.
This installation should be made by a qualified service person and should conform to all the
local codes.
Please install blackouts equipment into the power supply circuit for convenient supply
interruption.
If the product does not work properly, please contact your dealer or the nearest service center.
Never attempt to disassemble the camera yourself. (We shall not assume any responsibility for
problems caused by unauthorized repair or maintenance.)
Preventive and Cautionary Tips
Make sure the power supply voltage is correct before using the device.
Do not drop the device or subject it to physical shock.
Do not place the device in extremely hot, cold temperatures (please refer to the product
specification for the operating temperature), dusty or damp environment, and do not expose
it to high electromagnetic radiation.
To avoid heat accumulation, good ventilation is required for a proper operating environment.
Keep the device away from water and any liquid.
While shipping, the device should be packed in its original packing.
Symbol
Description
Provides additional information to emphasize or supplement
important points of the main text.
Indicates a potentially hazardous situation, which if not avoided,
could result in equipment damage, data loss, performance
degradation, or unexpected results.
Indicates a hazard with a high level of risk, which if not avoided, will
result in death or serious injury.
