Specifications:
* Supply voltage: 5V DC (via USB-C) of 3.3V DC (via 3V3 pin)
* GPIO voltage: 3.3V*
* Output voltage: 5V DC (via 5V pin)
* Main chip: ESP32 (WROVER module, 240Mhz dual-core processor) * Flash memory: 4MB
* SRAM: 520 kB
* PSRAM: 8MB
* Built-in Wi-Fi
* Built-in BT
* USB to serial converter: CP2104 or CH9102F (drivers)
* Built-in SIM800L GSM GPRS module
* Built-in Nano SIM card connection
* Built-in power management chip (IP5306) with Li-ion/Li-Po battery charging circuit (~500mA charging current)
GSM/GPRS Module
SIM800-WB64 is a complete Quad-band GSM/GPRS solution in an SMT type that can be embedded in customer applications. SIM800-WB64 supports Quad-band 850/900/1800/1900MHz, it can transmit Voice, SMS, and data information with low power consumption. With a tiny size of 24*24*3 mm, it can fit into the slim and compact demands of customer design. Featuring Bluetooth and Embedded AT, it allows total cost savings and fast time-to-market for customer applications.