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 PCB area. Features: SDIO 2.0, SPI, UART 32-pin QFN package Integrated RF switch, balun, 24dBm PA, DCXO, and PMU Integrated RISC processor, on-chip memory and external memory interfaces Integrated /baseband processors Quality of Service management I2S interface for high fidelity audio applications On-chip low-dropout linear regulators for all internal supplies Proprietary spurious-free clock generation architecture Integrated WEP, TKIP, AES, and WAPI engines Solutions Supports APSD for optimal VoIP applications Patented spurious noise cancellation algorithm for integration in SOC applications Supports Bluetooth co-existence interface Self-calibrated RF to ensure optimal performance under all operating conditions Zero factory tuning No external RF components Specifications 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) 1. High quality & low price 2. LWIP agreement 3. Support 3 modes: AP, STA, AP+STA 4. Perfect and simple AT commands Now for Arduino can get on WiFI without braking the bank. Use this module for your next Interet of Things project, home automation, Or remote sensor project. This module adats the ESP8266 IC for use over a serial connection using simple AT commands. No SPI interface or Know-How is required.