Features: Chipset:ESPRESSIF-ESP32 240MHz Xtensa® single-/dual-core 32-bit LX6 microprocessor FLASH:QSPI flash 4MB / PSRAM 8MB SRAM:520 kB SRAM Button:Reset USB to TTL:CP2104 Modular interface:UARTSPISDIOI2CLED PWMTV PWMI2SIRGPIOcapacitor touches sensorADCDACLNA pre-amplifier On-board clock:40MHz crystal oscillator Working voltage:2.7V-3.6V Working current:About 70mA Sleep current:About 300uA SIM card:Only supports Nanos SIM card Working temperature range:-40centigrade 85centigrade SizeWeight:78.83mm*28.92mm*8.06mm Power Supply Specifications Power Supply:USB 5V/1A Charging current:500mA Battery:3.7V battery JST Connector:2Pin 1.25mm USB:Type-C Wi-Fi Standard:FCC/CE-RED/ICs/TELEC/KCC/SRRC/NCC Protocol:802.11 b/g/n802.11n,speed up to150MbpsA-MPDU and A-MSDU polymerization,support 0.4μS Protection interval Frequency range:2.4GHz2.5GHz2400M2483.5M Transmit Power:22dBm Communication distance:300m Bluetooth Protocol:meet bluetooth v4.2BR/EDR and BLE standard Radio frequency:with -97dBm sensitivity NZIF receiver Class-1,Class-2Class-3 emitter AFH Audio frequency:CVSDSBC audio frequency Software specification Description Wi-Fi Mode:Station/SoftAP/SoftAPStation/P2P Security mechanism:WPA/WPA2/WPA2-Enterprise/WPS Encryption Type:AES/RSA/ECC/SHA Firmware upgrade:UART download/OTAThrough networks/host to download and write firmware Software Development:Support cloud server development /SDK for user firmware development Networking protocol:IPv4IPv6SSLTCP/UDP/HTTP/FTP/MQTT User Configuration:AT Instruction set, cloud server, android/iOSapp OS:FreeRTOS Package List: 1 x T-Call V1.3 1 x Power cord 2 x Pin header 1 x FPC antenna