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.
 
Specification:-
1MB Flash Memory
802.11 b/g/n Standards
Wi-Fi Direct (P2P), soft-AP
Wake up and transmit packets in < 2ms
Standby power consumption of < 1.0mW
Integrated low power 32-bit CPU could be used as an application processor
 
Features :
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)