Incredibly clear, sharp text and images from an unsurpassed high resolution display at 1024 x 600 delivering 169 pixels per inch (PPI). It is reduced glare and optimum brightness for reading indoors or outside. Backlit is designed for easy reading day or night. Expand your memory up to 32GB with microSD memory card. Use NOOKcolor as an audio player for your MP3 and AAC files to listen to audio books or music. NOOKcolor holds up to 100 hours of audio. Watch videos in MP4 format. Customize your NOOKcolor quickly and easily. Load your own photos to create personal wall papers. Keep a gallery of cherished pictures and fun videos on your NOOKcolor.