SDHC memory card combines massive storage capacity and fast data-transfer rates in a memory card no bigger than a postage stamp. It is the ideal expansion option for your Philips Pocket Memo dictation recorder. Speed class rating 4 offers transfer rates of up to 4MB per second for quick and easy download and file transfer. Built-in write-protection switch prevents accidental loss of data. 4GB Secure Digital (SD) Card is designed for use with Philips Digital Pocket Memo 9370, 9375, 9380 and 9399.