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Hello, thank you for the question. The Insignia HDMI 2‑Output Splitter is designed to take one HDMI input and send it to two displays, so it cannot be used to combine two sources (cable box + Blu‑ray) into one TV input. For that setup, you would need an HDMI switch, not a splitter. The USB cable does need to be plugged in for power, typically into the TV’s USB port or any standard USB power adapter. Poojitha | Insignia
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