LILYGO® TTGO T-Call V1.4 ESP32 Wireless Communication Module FPC Antenna SIM Card SIM 800L ModuleFeatures: brand new and high qualityWi-Fi Mode:Station/SoftAP/SoftAP+Station/P2P.Security mechanism:WPA/WPA2/WPA2-Enterprise/WPS.Encryption Type:AES/SHA.Firmware upgrade:UART download/（Through network/host to download and write firmware）.Software Development:Support cloud server development /SDK for user firmware development.Networking protocol:IPv4、IPv6、TCP/UDP/HTTP/FTP/MQTT.User Configuration:AT + Instruction set, cloud server, android/iOSapp.OS:FreeRTOS.Specifications: Type: SIM 800L / SIM 800H(optional)Chipset:ESPRESSIF-ESP32 240MHz Xtensa® single-/dual-core 32-bit LX6 microprocessorFLASH:QSPI flash 4MB / PSRAM 8MBSRAM:520 kB SRAMButton:ResetUSB to TTL:CH9102F QFN24Modular interface:UART、SPI、SDIO、I2C、PWM、I2S、ADCOn-board clock:40MHz crystal oscillatorWorking voltage:2.7V-3.6VWorking current:About 70mASleep current:About 1.1mASIM card:Only supports Nano SIM cardPower Supply:USB 5V/1ACharging current:500mABattery:3.7V lithium batteryJST Connector:2Pin 2.0mmUSB:Type-CWi-Fi Standard:FCC/CE-RED/IC/SRRC/NCC(esp32 chip)Protocol:802.11 b/g/n(802.11n，speed up to150Mbps)A-MPDU and A-MSDU polymerization，support 0.4μS Protection intervalFrequency range:2.4GHz~2.5GHz(2400M~2483.5M)Transmit Power:22dBmCommunication distance:300mBT Protocol:meet v4.2BR/EDR and BLE standardRadio frequency:with -97dBm sensitivity NZIF receiver Class-1,Class-2&Class-3 Audio frequency:CVSD&SBC audio frequencySize: approx. 75x29mm/2.95x1.14inPackage Includes: 1 X T-Call CH9102 V1.4 Version1 X Power Cable(PH 2pin 2.0mm)1 X SIM Antenna(7 cm)2 X PinNote: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!