My mom got us a soundbar because she didn't have space for it anymore. Unfortunately, one day the subwoofer started blinking and wouldn't connect to the soundbar, rendering the soundbar unusable. The only way to reset the subwoofer is to use the remote control, which we didn't have (oops). I bought this, connected the battery and it worked straight away with the soundbar. Strange but useful for us! The soundbar and subwoofer now work properly. Very satisfied. Will be updated if problems arise.
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