SUBALIGU ESP8266 ESP-01S 5V WiFi Relay Module Things Remote Control Switch for Phone APP ESP01S Wireless WiFi Module…
Amazon.com Price: $12.89 (as of 06/02/2022 16:51 PST- Details)
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ESP-01s is the latest version with 1MB Flash Memory, upgraded from 512KB. It’s an improved version of ESP-01, optimized circuit and wiring to improve WIFI radio performance.
ESP-01s run LWIP Protocol internally, which support three modes: AP, STA, AP + STA coexistence mode.
