Features:
The compatible board can directly connect to this module.
It is widely used in networking, smart home project when it is connected to the WiFi router. 
With the help of ESP-01 adapter module, it can be connected directly with the  5V MCU development board.　
It is TTL serial communication interface and its parameters can be set by AT command.

Support three modes: for AP, for STA, for AP+for STA coexistence mode
Compatible with 5V/3.3V, and powerful internal LWIP protocol

Specification:
Interface logic voltage: 3.3V / 5V compatible(On-board level shift circuit)
Working voltage: 4.5V - 5.5V (On-board 3.3v LDO Regulator)
Working current:0- 240mA
Module size: 4.2*2.5cm/1.7*1in
Adapter size: 2.5*1.5cm/1*0.6in

Weight: Approx.8g/0.3oz

Package list:
1 x Wi-Fi Wireless Module
1  x Adapter