参考网站:

1. https://heltec.org/project/wireless-stick/ 

2. Wireless Stick（V3） – Heltec Automation 

3. Heltec ESP32 LoRa – Arduino (ESP8266) (edu2web.com) 

4. https://www.aliexpress.com/item/1005005164159779.html 

Wireless Stick(V3):

CE Certificate;

Microprocessor: ESP32-S3FN8 (Xtensa® 32-bit LX7 dual core processor, five stage pipeline rack Structure, main frequency up to 240MHz);
SX1262 LoRa node chip.

Micro USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures;
Onboard SH1.25-2 battery interface, integrated lithium battery management system (charge and discharge management, overcharge protection, battery power detection, USB / battery power automatic switching);
Integrated WiFi, LoRa, Bluetooth three network connections, onboard Wi-Fi, Bluetooth dedicated 2.4GHz metal 3D antenna, reserved IPEX (U.FL) interface for LoRa use;
Onboard 0.49-inch 64*32 dot matrix OLED display, which can be used to display debugging information, battery power, and other information;
Integrated CP2102 USB to serial port chip, convenient for program downloading,debugging information printing.
Support the Arduino development environment;
(Exclusive) Supports the Arduino version of the ESP32 + LoRaWAN protocol routine provided by Heltec. This is a standard LoRaWAN protocol that can communicate with any gateway/base station running the LoRaWAN protocol (requires serial number activation, only the development of the company) The board is available, the serial number can be queried on this page);
With good RF circuit design and basic low-power design (sleep current ≤800uA), it is convenient for IoT application vendors to quickly verify solutions and deploy applications.

• Master Chip:ESP32-S3FN8 (Xtensa®32-bit lx7 dual core processor)

• LoRa Chipset :SX1262

• USB to Serial Chip :CP2102

• Frequency :470~510 MHz, 863~928 MHz

• Max. TX Power: 21 ± 1 dBm

• Max. Receiving sensitivity :-139 dBm

• Wi-Fi: 802.11 b/g/n, up to 150Mbps

• Bluetooth :Bluetooth LE: Bluetooth 5, Bluetooth mesh

• Display :0.49-inch OLED

• Hardware Resource: 7*ADC1 + 2*ADC2; 7*Touch; 3*UART; 2*I2C; 2*SPI; etc.

• Memory:384KB ROM; 512KB SRAM; 16KB RTC SRAM; 8MB SiP Flash

• Interface:Type-C USB; 2*1.25 lithium battery interface; LoRa ANT(IPEX1.0); 2*17*2.54 Header Pin

• Battery :3.7V lithium battery power supply and charging

• Operating temperature :-20 ~ 70 ℃

• Dimensions:58.08 * 22.6* 8.2 mm