This part is a kind of semiconductor called AR9331.

Function of this product has Highly-Integrated and Cost Effective IEEE 802.11n 1x1 2.4 GHz SoC.

Manufacturers : Atheros

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Some of the text within the PDF file :

Data Sheet PRELIMINARY December 2010 AR9331 Highly-Integrated and Cost Effective IEEE 802.11n 1x1 2.4 GHz SoC for AP and Router Platforms General Description The Atheros AR9331 is a highly integrated and cost effective IEEE 802.11n 1x1 2.4 GHz Systemon-a-Chip (SoC) for wireless local area network (WLAN) AP and router platforms. In a single chip, the AR9331 includes a MIPS 24K processor, five-port IEEE 802.3 Fast Ethernet Switch with MAC/PHY, one USB 2.0 MAC/PHY, and external memory interface for serial Flash, SDRAM, DDR1 or DDR2, I2S/SPDIF-Out audio interface, SLIC VOIP/PCM interface, UART, and GPIOs that can be used for LED controls or other general purpose interface configurations. The AR9331 integrates two Gbit MACs plus a five-port Fast Ethernet switch with a four-traffic class Qualit [ ... ]

AR9331 PDF Datasheet Download