4pcs ESP8266 ESP-01S WiFi Serial Transceiver Module with 1MB
Flash for ArduinoFeature: SDIO 2.0, SPI, UART32-pin QFN packageWi-Fi Direct (P2P), soft-APIntegrated TCP/IP protocol stackIntegrated TR switch, balun, LNA, power amplifier and matching networkIntegrated PLLs, regulators, DCXO and power management units+ 19.5 dBm output power in 802.11 b modePower down leakage current of andlt; 10uAIntegrated low power 32-bit CPU could be used as application processorSDIO 1.1 / 2.0, SPI, UARTSTBC, 11 MIMO, 21 MIMOA-MPDU andamp; A-MSDU aggregation andamp; 0.4 ms guard intervalIntegrated RF switch, balun, 24dBm PA, DCXO, and PMU Integrated RISC processor, on-chip memory and external memory interfacesIntegrated MAC/baseband processorsQuality of Service managementI2S interface for high fidelity audio applicationsOn-chip low-dropout linear regulators for all internal suppliesProprietary spurious-free clock generation architectureThe PCB layout has changed for an improvement in WiFi radio performance. Package Including4 * ESP8266 ESP-01S WiFi Serial Transceiver Module