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Generic: 3.7V 600mAh Lithium Polymer Battery Sound Detection Sensor Module or it can lie in Do not apply a or it can lie in between 4to8 ohms Variant Name USB Interface USB UART Chip Pins Notes ESP32 CP2102 MicroUSB 30Pins Micro USB CP2102 30 Standard compact board ESP32 CP2102 TypeC 30Pins Type C CP2102 30 Modern USB C connector ESP32 CP2102 MicroUSB 38Pins Micro USB CP2102 38 More GPIO access ESP32 CP2102 TypeC 38Pins Type C CP2102 38 Full featured GPIO layout ESP32 CH9102X MicroUSB 30Pins Micro USB CH9102X 30 Cost effective UART ESP32 CH9102X MicroUSB 38Pins Micro USB CH9102X 38 Expanded I O ESP32 CH340C MicroUSB 38Pins Micro USB CH340C 38 Widely supported USB UART ESP32 CH340C TypeC 30Pins Type C CH340C 30 Compact Type C board ESP32D CP2102 OLED MicroUSB 26Pins Micro USB CP2102 26 Onboard OLED display ESP32U CH9102X Varies CH9102X Varies External antenna support ESP32D CH9102X Varies CH9102X Varies Integrated antenna ESP32U CP2102 Varies CP2102 Varies External antenna version ESP32D CP2102 Varies CP2102 Varies Integrated antenna version ESP32D FT232 Micro USB FT232 30 Wide Compatibility Suitable for a variety of devices smart devices
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