RF Transceiver IC ESP8266EX QFN-32

From the shop's description

Manufacturer Espressif Systems Mfr. Part # ESP8266EX Specifications: Attribute Value Category RF & Radio/RF Transceiver ICs Datasheet Espressif Systems ESP8266EX Description 2.5V ~ 3.6V 16dBm UART TxRx + MCU 2.4GHz QFN-32_5x5x05P RF Transceiver IC Voltage – Supply 2.5V ~ 3.6V Power – Output 16dBm Serial Interfaces UART RF Family/Standard WiFi Protocol 802.11b/g/n/e/i Type TxRx + MCU Data Rate (Max) – Sensitivity -91dBm Modulation – Frequency 2.4GHz