Remote Serial WiFi Transceiver is just like ESP-01. Well, an upgraded version we could say. Like its predecessor, ESP-01E can communicate with AT commands, or be flashed with Lua or even be used with an Arduino. However, the flash memory size has been doubled from 512 KB to 1 MB.With exact same dimensions of ESP-01, ESP-01E is tiny (25mm x 15mm) and fits in compact space, with simple pin connections (standard 2×4 pin headers). Similer to the previous version, communication with ESP-01E can be done over serial TX/RX pins using AT commands. AT commands help with querying and changing the configurations of WiFi module. Package includes : 1x Wi-Fi Module SKU: PGI-0011482 Category: Arduino Modules