The Transcend 4 GB 133x CompactFlash I Card operates in both dual-channel transfer and the Ultra DMA mode 4 standard. With the built-in Error Correcting Code, the CompactFlash card analyses and autocorrects any potential transfer errors. It is an ideal option for beginners and amateurs using DSLR cameras and camcorders. This Transcend CompactFlash Card ensures reliability and 133x superior performance at up to 50 Mbps read and 20 Mbps write transfer speeds, respectively.