LG KM710 Service Manual page 100

5.2.2 In case of using the PIF( MON Port)
5.2.2.1 Preparation
- Target Handset (KM710c)
- PIF
- RS-232 Cable and PIF-to-Phone interface Cable
- Power Supply or Battery
5.2.2.2 IBM compatible PC supporting RS-232 with Windows 98 or newer
If you use battery, you should have a battery with the voltage above 3.7V.
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KM710 Handset
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