100% brand new and high quality Features: Supports many control chip:Fully compatible with Arduino-, 51 series, MSP430 series,STM32/2, CSR chip, etc.(a lot of routines for reference) Wide voltage support:without any modification, directly supports 3.3V ~ 5V DC Ultra-low power consumption:Normal operation Is 0.04W IO port occupies minimal display:The IIC communication,as long as the two IO ports Operating frequency: 433/470MHz(433HMz version) /868M/915M(868MHz version) Transmit power: +20dBm OLED is not soldered to T-Beam Specifications: Lastest ESP32 Version: REV1 WIFI & Bluetooth-compatible 8MB PSRAM 4MB Flash 3D Antenna Antenna Type :433Mhz /868Mhz /915Mhz /923 Mhz (Optional) Working voltage: 1.8~3.7v Acceptable current:10~14mA Transmit current: 120mA@+20dBm 90mA@+17dBm 29mA@+13dBm Transmit power: +20dBm Receive sensitivity :-139dBm@LoRa &62.5Khz&SF=12&146bps 136dBm@LoRa &125Khz&SF=12&293bps 118dBm@LoRa &125Khz&SF=6&9380bps 123dBm@FSK&5Khz&1.2Kbps Frequency error:+/-15KHz FIFO space :64Byte Data rate :1.2K~300Kbps@FSK 0.018K~37.5Kbps@LoRa Modulation Mode :FSK,GFSK,MSK,GMSK,LoRa TM,OOK Interface form :SPI Sleep current :0.2uA@SLEE 1.5uA@IDLE Operatingtemperature:-40- +85 Digital RSSI function Automatic frequency correction Automatic gain control Low voltage detection Fast wake-up and frequency hopping Highly configurable data packet handler LORA [LORA antenna connector is RG316] GPS modules NEO-6M, 3V-5V power supply Universal Destined module with ceramic antenna, signal super Save the configuration parameter data EEPROM Down There are LED signal indicator Default Baud Rate: 9600 Power Power Supply Input: USB 5V/1A Charging current: 500mA Battery Input: 3.7-4.2V Charge IC: AXP192 OLED Size:0.96 inch white OLED High resolution:128 x 64 Viewing angle:> 160 Driver IC:SSD1306 Working temperature:-30 celcius ~ 80 celcius Module volume (generous):27.0MM x 27.0MM x 4.1MM Note: OLED is not soldered to T-Beam Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 0-2cm. Package Includes: 1 X TTGO T-Beam 1 X 433MHz or 868MHz Antenna 1 X 0.96 inch 128X64 OLED 2 X Pin