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:UART、SPI、SDIO、I2C、LED PWM、TV PWM、I2S、IRGPIO、capacitor touches sensor、ADC、DACLNA 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 Size&Weight: 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/n( 802.11n,speed up to150Mbps)A-MPDU and A-MSDU polymerization,support 0.4μS Protection interval Frequency range: 2.4GHz~ 2.5GHz(2400M~ 2483.5M) Transmit Power:22dBm Communication distance:300m Bluetooth Protocol:meet bluetooth v 4.2BR/EDR and BLE standard Radio frequency:with -97dBm sensitivity NZIF receiver Class-1,Class-2&Class-3 emitter AFH Audio frequency:CVSD&SBC audio frequency Software specification Description Wi-Fi Mode:Station/SoftAP/SoftAP+Station/P2P Security mechanism:WPA/WPA2/WPA2-Enterprise/WPS Encryption Type:AES/RSA/ECC/SHA Firmware upgrade:UART download/OTA(Through networks/host to download and write firmware) Software Development:Support cloud server development /SDK for user firmware development Networking protocol:IPv4、IPv6、SSL、TCP/UDP/HTTP/FTP/MQTT User Configuration:AT + Instruction set, cloud server, android/iOSapp OS:FreeRTOS Package List: 1 x T-Call V 1.3 1 x Power cord 2 x Pin header 1 x FPC antenna