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USB On-The-Go, often abbreviated USB OTG, is a pecification that allows USB devices such as digital audio players or mobile phones to act as a host allowing a USB Flash Drive, mouse, or keyboard to be attached.
USB On-The-Go (OTG) allows two USB devices to talk to each other without requiring the services of a personal computer (PC). Although OTG appears to add peer-to-peer connections to the USB world, it does not. Instead, USB OTG retains the standard USB host/peripheral model, in which a single host talks to USB peripherals.
OTG does introduce, however, the dual-role device, or simply stated, a device capable of functioning as either host or peripheral. Part of the magic of OTG is that a host and peripheral can exchange roles if necessary.
Before OTG, the concept of an embedded host was already established in the USB world. Instead of duplicating the full UHCI/OHCI USB controllers and drivers built into PCs, most embedded host chips provide limited hosting capabilities. This makes them better suited to the embedded environment than a PC with its huge resources and infinite capacity for drivers and application software.
So this cable can completely instead of a high-priced USB Adapter to accomplish the same work.
Attention: please make sure that your device has OTG function first, it works with Android devices WITH custom ROM/Kernel that support USB Host mode.
With this Host OTG cable, it lets your device connect to most USB Flash Drives, Mouse & Keyboards. Please note that some of them may not be compatible. You can connect this to your external harddisk, but please make sure that you have external power source for the harddisk. Last but not least, it also work with non-power hungry card reader.
Please make sure that all external storage devices are formatted in FAT32, not NTFS or FAT, otherwise they won't be detected by your device