Sorry, this device does not work with the Samsung A7 10.4 tablet. In the description of the device, note that the device must be connected to it (e.g. a tablet). The USB-C port must be Gen 3.1 and MHL Active. Otherwise you have to buy a special cable/device that delivers the signal. Alternatively, if you have a Smart TV that supports "Smart View" that sends the signal to your display via a router.
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