The ESP 01 ESP8266 Serial WIFI Wireless Transceiver Module is a self-contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor.
Each ESP8266 module comes pre-programmed with an AT command set firmware, meaning, you can simply hook this up to your Arduino device and get about as much WiFi-ability as a WiFi Shield offers (and that?s just out of the box)! The ESP8266 module is an extremely cost-effective board with a huge, and ever-growing, community.
This module has a powerful enough on-board processing and storage capability that allows it to be integrated with the sensors and other application-specific devices through its GPIOs with minimal development up-front and minimal loading during runtime.
Wi-Fi Direct (P2P), soft-AP
Integrated TCP/IP protocol stack
It features an integrated TR switch, balun, LNA, power amplifier and matching network
Equips integrated PLL, regulators, DCXO and power management units
Integrated low power 32-bit CPU could be used as an application processor
SDIO 1.1 / 2.0, SPI, UART
STBC, 1?1 MIMO, 2?1 MIMO
A-MPDU & A-MSDU aggregation & 0.4ms guard interval
Wake up and transmit packets in < 2ms Standby power consumption of < 1.0mW (DTIM3)