Compatible with MacBook Pro 15.4" A1286 Mid 2010, Early 2011, Late 2011, Mid 2012 series. Compatible Models with A1286: MC371LL/A, MC372LL/A, MC373LL/A, MC721LL/A, MC723LL/A, MD318LL/A, MD322LL/A, MD103LL/A, MD104LL/A. Connector type: 4-Wire 4-Pin, Plug In, NO soldering is required. Compatible Part Number: 922-8700-A 922-8701-A. Apple Part #: 922-9308, 923-0085, 609-0237 Each pack come with 1x Right Speaker, 1x Left Speaker.