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The BTI is a small 2-in-1 adapter that either sends audio from a wired source to Bluetooth headphones or speakers (transmit) or turns a wired speaker or stereo into a Bluetooth receiver. It uses Bluetooth 5.0, which gives steadier links and lower power draw than older 4.x adapters. It suits people adding wireless audio to a TV, older stereo or car head unit without replacing the gear. It is a basic adapter: no RCA or coaxial jacks, so it works over 3.5 mm audio only, and it lacks the codec support and dual-device pairing of step-up models.
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Lowest price we've seen: $41.67 on Nov 11 at Newegg. Tracked across 1 store since Nov 11.
Owners treat it as a cheap, useful fix for making wired audio wireless. Most say setup is quick and the link holds at short range, but some report latency with video and short battery life.