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Hello, I have reviewed the user manual for the QFX BT-403 wireless speaker. This document covers the speaker's Bluetooth and FM modes, volume and track controls, LED lighting modes, different input options such as Micro-USB, AUX, and TF card ports, and the TWS connection feature for dual speakers. I'm ready to answer your questions about it.
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How to switch between Bluetooth and FM mode?
How to adjust volume?
How to connect two speakers using TWS?