This part is a kind of semiconductor called ATtiny841.

Function of this product has 8-bit AVR Microcontroller.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

ATtiny441/ATtiny841 8-bit AVR Microcontroller with 4/8K Bytes In-System Programmable Flash Features DATASHEET  High Performance, Low Power Atmel® AVR® 8-bit Microcontroller  Advanced RISC Architecture  120 Powerful Instructions – Most Single Clock Cycle Execution  32 x 8 General Purpose Working Registers  Fully Static Operation  Up to 16 MIPS Throughput at 16 MHz  Non-volatile Program and Data Memories  4/8K Bytes of In-System Programmable Flash Program Memory  Endurance: 10,000 Write/Erase Cycles  256/512 Bytes of In-System Programmable EEPROM  Endurance: 100,000 Write/Erase Cycles  256/512 Bytes Internal SRAM  Data Retention: 20 Years at 85oC / 100 Years at 25oC  Programming Lock for Self-Programming Flash & EEPROM Data Security  Periph [ ... ]

ATtiny841 PDF Datasheet Download