TTGO T-Call V1-3 ESP32 Wireless Module GPRS Antenna SIM Card SIM800L Module

Hardware Specifications ChipsetESPRESSIF-ESP32 240MHz Xtensa single-/dual-core 32-bit LX6 microprocessor FLASHQSPI flash 4MB / PSRAM 8MB SRAM 520 kB SRAM ButtonReset USB to TTLCP2104 Modular interfaceUART?SPI?SDIO?I2C?PWM?I2S?ADC On-board clock40MHz crystal oscillator Working voltage2.7V-3.6V Working currentAbout 70mA Sleep currentAbout 1.1mA SIM cardOnly supports Nano SIM card Working temperature range-40? ~ +85? Size&Weight78.83mm*28.92mm*8.06mm(11.77g) Power Supply Specifications Power SupplyUSB 5V/1A Charging current500mA Battery3.7V lithium battery JST Connector2Pin 1.25mm USBType-C Wi-Fi StandardFCC/CE-RED/IC/TELEC/KCC/SRRC/NCC(esp32 chip) Protocol802.11 b/g/n(802.11n?speed up to150Mbps)A-MPDU and A-MSDU polymerization?support 0.4?S Protection interval Frequency range2.4GHz~2.5GHz(2400M~2483.5M) Transmit Power22dBm Communication distance300m Bluetooth Protocolmeet bluetooth v4.2BR/EDR and BLE standard Radio frequencywith -97dBm sensitivity NZIF receiver Class-1,Class-2&Class-3 emitter AFH Audio frequencyCVSD&SBC audio frequency Software specification Wi-Fi ModeStation/SoftAP/SoftAP+Station/P2P Security mechanismWPA/WPA2/WPA2-Enterprise/WPS Encryption Type AES/RSA/ECC/SHA Firmware upgradeUART download/OTA?Through network/host to download and write firmware? Software DevelopmentSupport cloud server development /SDK for user firmware development Networking protocolIPv4?IPv6?SSL?TCP/UDP/HTTP/FTP/MQTT User ConfigurationAT + Instruction set, cloud server, android/iOSapp OSFreeRTOS More Information: https://github.com/Xinyuan-LilyGO/TTGO-T-Call