Hardware Specifications:
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 touch 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 Nano SIM card
Working temperature range: -40°C ~ +85°C
Size&Weight: Approx. 78.83mm*28.92mm*8.06mm (11.77g)
Power Supply Specifications:
Power Supply: USB 5V/1A
Charging current: 500mA
Battery: 3.7V lithium battery
JST Connector: 2Pin 1.25mm
USB: Type-C
Wi-Fi:
Standard: FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC
Protocol 802.11 b/g/n (802.11n, speed up to 150Mbps) 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 v4.2BR/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:
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 network/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

Packing list:
1*T-Call V1.3
1*Power cord
2*Pin header