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2.3. Antennas
There is one antenna for GSM to the left, and one dummy antenna for
future options to the right. If the antenna is removed, the SMA connector
can be connected to an external antenna instead (contact Sigicom for more
information on this matter).
GSM antenna:
900/1800 MHz for users within EU.
850/1900 MHz for US users.
2.4. Battery Module
The battery compartment behind the left side lid encloses two Li-Ion
battery modules. The power supply of the C12 always uses the battery
with the highest voltage, and the switch-over between the batteries is
automatic.
If the C12 is firmly mounted, the batteries can be replaced during normal
operation. A small lock lever holds both batteries in place when the
battery lid is removed.
To replace the batteries:
1. Remove the battery lid (a Torx-T20 screwdriver is needed).
2. Turn the lock lever to any side to release the first battery and
replace it.
3. Turn the lock lever to the other side and replace the second
battery.
4. Put the battery lid back again. Note that the lock lever must be
set to its middle position for the lid to fit.
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General