... activate to turn on unit.Pin10 External input signal reference, connect to GNDPin11 External microphone input port: positive MIC +.Pin12 ... cardOpen housing and install SIM as photo: 3. Connect wires: Basic function: Just connect two power pins (Pin1 & Pin2)Optional functions: ... function 8,9,10,11,12 It need connect relative wires and accessories. 4. Optional accessories: Power ...