Overview ESP-12 is a low power consumption of the UART-WiFi module, with very competitive price in the industry and ultra low power consumption technology, designed specifically for mobile devices and IOT applications, user's physical device can be connected to a WiFi wireless network, Internet or intranet communication and networking capabilities. From 2015/12/28 on, all shippment will be ESP-12E, It's enhanced version of ESP-12 and 100% compatiable with ESP-12. Specification Model:ESP8266-12 802.11 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 & 0.4μs guard interval Wake up and transmit packets in < 2ms Standby power consumption of < 1.0mW (DTIM3) Identical to adafruit item 2491 Warning 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) Documents ESP-12E Specification Module URL ESP8266 Wee Click ESP-01 Click ESP-12E Click ESP-12F Click ESP-13 / ESP-14 /