3Pcs Geekcreit ESP8266 Serial Wi-Fi Wireless ESP-01 Adapter Module 3.3V 5V

Description:

A adapter module for ESP-01 Wi-Fi module. 3.3V voltage regulator circuit and onboard level conversion circuit can make 5V microcontroller easy to use with ESP-01 Wi-Fi module.
Also, the item can be used with UNO R3 or compatible board.

Here is schenmatic: http://img.staticbg.com/file/products/20160408023336ESP-01%20Adapter%20module%20Schenmatic.pdf

Features:

Working voltage: 4.5~5.5V (On-board 3.3V LDO Regulator)

Working current: 0-240mA

Package included:

3 x ESP-01 Adapter module