Samsung 4GB DDR3 laptop memory module. This is a PC3-10600S stick running at 1333MHz. 

• Brand: Samsung

• Model: M471B5273CH0-CH9

• Capacity: 4GB

• Type: DDR3 SDRAM (SO-DIMM)

• Speed: PC3-10600S (1333MHz)

• Rank: 2Rx8 (Dual Rank)

• Voltage: 1.5V

• Pins: 204-Pin