OWC 4GB DDR3 1333MHZ memory module

4.0GB PC3-10600 DDR3 1333MHz SO-DIMM 204 Pin CL9 SO-DIMM Memory Upgrade Module for 2011 MacBook Pro(all sizes), Mid 2010/2011 21.5" & 27" iMac Models. Lifetime Warranty. (1333DDR3S4GB)

Features
Internal memory:	4 GB
Internal memory type:	DDR3
Memory clock speed:	1333 MHz
Component for:	PC/Server
Memory form factor:	204-pin SO-DIMM
ECC:
Buffered memory type:	Unregistered (unbuffered)
CAS latency:	9
Memory voltage:	1.5 V
Certification:	RoHS
Operational conditions
Operating temperature (T-T):	0 - 85 °C