4
3.1.
View and Buttons
No.
Item
Description
1
GPS LED (Blue) Indicating GPS and battery status, please refer to below
LED indications.
2
GSM LED
(Green)
Indicating GSM status, please refer to below LED
indications.
3
Answer/Hand-up
Button
Press to receive an incoming call.
Press to complete a conversation.
Long press for 2 seconds to send GPRS message to
the server when no incoming call or conversation.
4
SOS Button
Long press for 2 seconds, MT90 will dial 3
preauthorized phone numbers in turn. It will stop
dialing when one number answers. Meanwhile,
MT90 will send an SMS to the preauthorized phone
number and send GPRS message to the server if
GPRS function is enabled.
Press to wake up if MT90 is in sleep mode.
5
Microphone
It will run automatically when using listen-in and call
functions.
6
Speaker
It will run automatically when using call function.
7
Power On/Off
Button
Long press for 2 seconds to turn on MT90.
Long press for 2 seconds to turn off MT90.
Press to wake MT90 up from sleep mode, power
LED will slowly flash for 10 seconds.
8
Mini USB
Mini USB is used for charging, connecting to computer for
setting up parameters, updating software and so on.
9
/Logger
Button
Long press to turn up the volume.
Long press for 2 seconds to start hands-free
conversation.
In standby mode, long press for 2 seconds, when the buffer
“BI” once, the logger will run automatically.
（
MT90 will
log the route every 30 seconds automatically. Route record
can be exported with the computer.
Long press for 2 seconds again, when the buffer
