This part is a kind of semiconductor called ATtiny4.

Function of this product has 8-bit AVR Microcontroller.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

8-bit AVR Microcontroller ATtiny4 / ATtiny5 / ATtiny9 / ATtiny10 DATASHEET COMPLETE Introduction The Atmel® ATtiny4/5/9/10 is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny4/5/9/10 achieves throughputs close to 1 MIPS per MHz. This empowers system designer to optimize the device for power consumption versus processing speed. Feature • High Performance, Low Power AVR® 8-Bit Microcontroller • Advanced RISC Architecture – 54 Powerful Instructions – Most Single Clock Cycle Execution – 16 x 8 General Purpose Working Registers – Fully Static Operation – Up to 12 MIPS Throughput at 12 MHz • Non-volatile Program and Data Memories – 512/1024 Bytes of In-System Programmab [ ... ]

ATtiny4 PDF Datasheet Download