ESP8266 ESP-01S serial WiFi wireless transceiver module used 4MB Flash, not 1MB flash USB Programmer selectable working mode: On-board toggle switch. UART side for serial TTL debugging by AT commands, PROG for firmware programming
Wishiot 2pcs Esp8266 Esp-01 USB Adapter Programmer + 5pcs ESP8266 ESP-01S WiFi Module 4MB Wireless Serial Transceiver
by NeweggConsumer Electronics
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