This part is a kind of semiconductor called ATTINY261A.

Function of this product has (ATTINYx61A) 8-bit Microcontroller.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

Features • High Performance, Low Power AVR® 8-Bit Microcontroller • Advanced RISC Architecture – 123 Powerful Instructions – Most Single Clock Cycle Execution – 32 x 8 General Purpose Working Registers – Fully Static Operation – Up to 20 MIPS Throughput at 20 MHz High Endurance Non-volatile Memory Segments – 2/4/8K Bytes of In-System Self-Programmable Flash Program Memory • Endurance: 10,000 Write/Erase Cycles – 128/256/512 Bytes of In-System Programmable EEPROM • Endurance: 100,000 Write/Erase Cycles – 128/256/512 Bytes of Internal SRAM – Data retention: 20 Years at 85°C / 100 Years at 25°C – In-System Programmable via SPI Port – Programming Lock for Software Security Peripheral Features – One 8/16-bit Timer/Counter with Prescaler – One 8/10-bit High S [ ... ]

ATTINY261A PDF Datasheet Download