SMDT IoT-3399E, User Manual, Page: 9 / 24

Shenzhen
Smart Device Technology Co.,Ltd
◆
BAT1 RTC Battery Port
used to install the clock battery
，
supply power to the system clock when power outages.
NO. Definition Property Description
1 RTC input 3V input
2 GND ground
electrode
ground electrode
◆
MIC Port
Please note that the MIC is positive negative connection
，
not reverse.
NO. Definition Property Description
1 MIC- input MIC-
2 MIC+ input MIC+
◆
Port Of Receiving Remote Control
NO. Definition Property Description
1 IR input remote control signal input
2 GND ground
electrode
ground electrode
3 3V3 Power 3.3V output