SAFETY INSTRUCTION
Read this safety instruction and the manual first
Follow all instructions and information.
Do not lose this manual.
Do not use this apparatus under the rain or near the water.
Do not install the apparatus near heaters or in hot environments, do not use outside the
operating temperature range.
Do not open the apparatus, only qualified service technician are enabled to operate on it. The
apparatus needs servicing when it is not properly working or is damaged by liquids, moisture or
other objects are fallen in the apparatus.
Use only accessories or replacement parts authorized or specified by the manufacturer.
Clean the apparatus only with dry cloths, do not use liquids.
Report the serial number and the purchasing date in front of the manual. It is needed to have
proper replacement parts or accessories from the manufacturer.
When replacement parts are needed, use only replacement parts authorized from the
manufacturer. Substitution with not authorized parts could result in electric shock, hazards or
fire.
Keep attention on all the labels with warnings or hazards on the apparatus.
LED INDICATION (POWER SWITCH)
Led indication with bicolor led (red & green) on wireless power switch (fig. 3):
• Wireless transmission status: green when RF transmission power is on (on power on the device,
this LED is red and become green when the RF transmission power is on).
Battery status: green steady, slowly blinking (< 25%), quickly blinking (<12%)
• Modulation peak (if activated): red
PTT status: red if active
BATTERIES
MTH400 is working with 2 AA alkaline, NiMH or Lithium batteries (select correct type on setup
controls). Battery status can be checked on internal OLED display or looking to LED status on power
switch (see LED INDICATION section) ❸.
Battery substitution:
Open MIC body: unscrew counter-clockwise the below cover to access batteries holder;
Take out below battery to release upper battery leverage;
2nd battery falls down and can be remove
Attention: always replace both the batteries