USB3.0 SSD Harddisk Enclosure Cartridge Drive 2012 MacBook Pro Retina A1425 A1398 MC975 MC976 MC212 MD213

Package included:
1 x 2012 MacBook Pro Retina SSD Harddisk Enclosure
1 x USB3.0 cable ( about 50cm )
External Power Supply Excluded

Only for 
2012 MacBook Pro Retina A1425 A1398 MC975 MC976 MC212 MD213

Aluminum Case (Silver Color)
Extra small size: about 106mm x 40mm x 11mm 

SSD harddisk enclosure cannot power itself. All power from USB port.
Must make sure your computer USB 3.0 port can provide at least 2A current. Otherwise, MUST using supplememtary power supply.
If power not enough, SSD cannot be recognized or slow transfer. 
(Apple Retina SSD needs 3.3V - 2.39A, it clearly marked " 3.3V - 2.39A" on SSD Surface.)

Indication light:-
On, no blink - SSD is recognized
On, blink - Data transfer
Off - no power supply OR SSD is not recognized