Replacement Part #: 923-0557, 923-00509 - Replacement Laptop Built-in Speakers. Includes both the left and right speaker. Sound quality may differ slightly from the original OEM speakers. Model # Compatibility List (see product description for complete list): MacBook Pro 13" Retina A1502 2013 2014 2015 - Compatibility: ME866LL/A, ME866LL/A, MGX72LL/A, MGX92LL/A, MGX92LL/A, MF839LL/A, MF841LL/A, MF843LL/A - Replacement Part #: 923-0557, 923-00509 Compatible with: MacBook Pro Retina 13" A1502 Late 2013: ME864LL/A (2.4 Core i5) Late 2013: ME866LL/A (2.6 Core i5) Late 2013: ME866LL/A (2.8 Core i7) Mid 2014: MGX72LL/A (2.6 Core i5) Mid 2014: MGX92LL/A (2.8 Core i5) Mid 2014: MGX92LL/A (3.0 Core i7) Early 2015: MF839LL/A (2.7 GHz Core i5) Early 2015: MF841LL/A (2.9 GHz Core i5) Early 2015: MF843LL/A (3.1 GHz Core i7)