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Based on the ESP8266 Chipset the ESP-01 is an affordable way to expand projects to the Internet. Running at 3.3 Volt with a Serial Rate of 115200 Baud. This WIFI Transceiver Module is a cheap TTL (Serial to Wireless) device.
SPECS
802.11 b/g/n
Integrated TCP/IP protocol stack
Wi-Fi Direct (P2P), soft-AP
Integrated TR switch, balun, LNA, power amplifier and matching network
Integrated PLLs, regulators, DCXO and power management units
Power down leakage current of 10uA
SDIO 1.1/2.0, SPI, UART
Integrated low power 32-bit CPU could be used as application processor
Standby power consumption of 1.0mW
Wake up and transmit packets in 2ms
Size 21.1mmx13.2 mm