A mobile phone may read from removable media as the host device, but present itself as a USB Mass Storage Device when connected to a host computer. Use of USB OTG allows those devices to switch back and forth between the roles of host and device. USB On-The-Go ( USB OTG or just OTG) is a specification first used in late 2001 that allows USB devices, such as tablets or smartphones, to also act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mouse or keyboards, to be attached to them. USB On-The-Go adapter for USB-B Micro charging ports of smartphones and tablet computers without dedicated USB-A port
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