Catalog > Internet of Things (IOT) Related Products > More Platforms ESP8266-ESP01 WiFi Download Module ESP8266-ESP01 WiFi Download Module HKD ESP-01 USB PROGRAM ADAPTER-3 ESP8266-ESP01 WiFi Download Module. Uses CH340G USB to Serial Port Chip. On-Board Toggle Switch. UART Side for Serial TTL Debugging by at COMMANDS, ‘PROG’ for Firmware Programming 74.35 ZAR inc for 1 Each 2 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE