Physical connection

Physical connection

S0: Serial port 0. This is typically used for connecting to external devices or modules using a serial communication protocol. It's often used for data transfer.

POWER: Power input. This is where the main power supply is connected to provide the necessary voltage to operate the device.

SIM Card: Subscriber Identity Module card. This is a small removable card that stores the subscriber's identification information, used for cellular networks.

ANT0: Antenna GPS. 

ANT1: Antenna LTE.

SPK: Speaker. This is the audio output device used to produce sound.

MIC: Microphone. This is the audio input device used to capture sound.