The Four-in-One Reader Writer is a USB 2.0 hot-swapped device. The four slots on this unit accept SD, Mini SD, SDHC, Memory Stick, M2 Flash Card, MMC, MMC2, RS MMC, Ultra 2 SD, Extreme SD, Extreme 3, T Flash, Micro SD (no adapter required), MS Pro, MS Duo, MS Pro Duo, MS MG, MS Pro MG, MS Duo MG and M2 card formats and provides bi-director USB 2.0 data transfer from camera to computer. The easy-to-use plug-and-play operation makes this card an attractive and affordable purchase for anyone who needs to store or transport their files, images or videos. It also contains an LED indicator light to show the unit is functioning.