It's a NE555 Precision Timers IC. This is 8 pin integrated circuit of timer IC which is used to generate clock signal for various application. These devices are precision timing circuits capable of producing accurate time delays or oscillation

Features:

• Timing from Microseconds to Hours
• Astable or Monostable Operation
• These devices are precision timing circuits capable of producing accurate time delays or oscillation
• Delay Timing from microseconds to hours
• Adjustable duty cyclist-compatible output can sink or source up to 200 ma
• Astable or Monostable operation 
• Adjustable Duty Cycle

Specifications: