Product Specifications Brand Crucial Form Factor SODIMM Total Capacity 4GB Warranty Limited Lifetime Specs DDR3 PC3-12800 CL=11 Unbuffered NON-ECC DDR3-1600 1.35V lead free halogen free for Mac Series Crucial ECC NON-ECC Module Qty 1 Speed 1600 MT/S Tracer False Voltage 1.35V DIMM Type Unbuffered Bullet Features Increases system performance