ESP8266 ESP-01S Remote Serial Port WIFI Transceiver Wireless Module AP STA CZ

Product details of ESP8266 ESP-01S Remote Serial Port WIFI Transceiver Wireless Module AP STA CZ
ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
ESP8266 has powerful on-board processing and storage capabilities that allow 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. Its high degree of on-chip integration allows for minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal area.

Specification of ESP8266 ESP-01S Remote Serial Port WIFI Transceiver Wireless Module AP STA CZ
802.11 b/g/n
Wi-Fi Direct (P2P), soft-AP
Integrated TCP/IP protocol stack
Integrated TR switch, balun, LNA, power amplifier and matching network
Integrated PLLs, regulators, DCXO and power management units
+19.5dBm output power in 802.11b mode
Power down leakage current of <10uA
Integrated low power 32-bit CPU could be used as 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)
The red (Power) and   blue (WiFi) LEDs are placed next to the antenna engraved on the PCB
Flash Memory: 1 Mo

Warnings:
This module requires a 3.3 volt supply for VCC, and 3.3V logic. It is not 5V tolant. Connect RX or TX on 5V Arduino will
destroy this module. You must use a logic level converter, or a 3.3V Arduino

The 3.3V supply on the Arduino Uno has inadequate current capabilit to power this module. You must provide a separate,
higher 3.3V supply(about 300mA or better)

The ESP8225 module is very new on the market and support and documentation for it is currently very limited.