I purchased this computer when I entered university, but I no longer use it, so I'm selling it. I'm not very knowledgeable about electronics, so I may not be able to answer all your questions. There are no problems with keyboard input or power. Please note that returns are not accepted. - Model: MacBook Air - Number: A1466 - Size: 13-inch - Processor: Core i5 - Color: Silver - Keyboard Language: Japanese - Accessories: Original box included - Condition: There are stains and stickers on the surface. Thank you for looking.