Specifications: MCU: ESP-WROOM-32D based on Espressif ESP32 dual core Tensilica LX6 processor with 802.11 b/g/n WiFi and Bluetooth 4.2 LE. SIM7600CE-M1S module: is a 2G/3G/4G communication and positioning module, supports LTE CAT4 download up to 150Mbs. Support GPS, BeiDou, Glonass, LBS Working voltage: 4.5-20VDC if using adapter or via USB cable. USB-UART circuit using CP2102 driver with good performance Standard size Arduino UNO Using nano simcard slot (Push pull) The standard 4V/2A power circuit also provides full power for the SIM module (if using a sim module, it should be powered from an external adapter to ensure stable operation). Communicate: Control module SIM via UART 2 of ESP32 ( GPIO16, GPIO17 ) Network status LED Led IO: IO2 Reset SIM module (IO18): high level Announced prices: 60$/pcs