The WT8266-S6 ESP-12S is a WiFi module manufactured by Wireless-Tag. This module is ROHS certified and features an SMD design, measuring 16x24mm. It is capable of 802.11 b/g/n wireless connections, delivering up to 150 Mbps transmission rate in the 2.4 GHz frequency band. The module also integrates TCP/IP protocol stack and low power features, allowing it to be used in many applications including home automation, smart home and retail applications. Additionally, it also features several built-in interfaces such as UART, SPI, SDIO, HS UART, I2S, GPIO, and PWM.