Essential ULTRA 16GB MicroSDHC Garmin nuvi 40 Card with custom format for Hi-Speed Lossless certified recording! With SD Adapter. (Class 10, up to 500x or 70MB/sec) This Factory Direct MicroSDHC card is specifically designed for the Garmin nuvi 40! Save, Backup, Archive while Easily Sharing your content collections with friends, family. SanDisk's removable storage solution is specifically designed for secure expansion slots. SPECIFICATIONS: Class 10, UHS-1, 350x-500x Read Speeds, Up to 70MB/s Read speed and Up to 25MB/s Write Speeds tested on a Mac &amp; PC. *BUY NOW - NEWEST VERSION NOW AVAILABLE!*