An ESP-01 Adapter 3.3V 5V Board for ESP-01 Wi-Fi module 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 Arduino UNO R3 or compatible board Note: Package will include only one ESP-01 Adapter board without an ESP-01 module. Connection Diagram: Specifications and Features: On-board level shift circuit Arduino UNO R3 and the compatible board can directly connect to this module; Interface logic voltage: 3.3V / 5V compatible(On-board level shift circuit); Working voltage: 4.5~5.5V (Onboard 3.3V LDO Regulator); Working current: 240mA(MAX). Package Includes: 1 x ESP-01 Adapter 3.3V 5V Board SKU: PGI=0062434 Category: Break out Boards