Under $50
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Kasa Smart KL400L5 16.4ft Wi-Fi LED Light Strip
16.4ft of vibrant, app-controlled color that syncs to your music and mood.
FFJ TV LED Backlight Strip with Sensor, App & Music Sync (11.5ft, for 32-50 Inch)
TV backlight that automatically syncs colors to your screen's content via a built-in sensor.