Review on 🔊 Miccus Long Range Bluetooth Transmitter or Receiver for Stereo Sound System Speakers, Amplifier, PC, Phone, Mac, Desktop Extender - 3.5mm AUX RCA (Home RTX - 2 Year Warranty) by Jeff Olson

I thought the first unit was DOA. It turned out that the power supply plugs were not making contact with my surge protector/extension cord, which is used for all other components of the home AV system. I had to replace another power supply to make it work. The transmitter quickly paired with rechargeable indoor/outdoor speakers (Monster BTW249 High Power 40W Indoor/Outdoor Bluetooth Speakers, Expandable to 8 Speakers, Waterproof and Wall Mounted (Two Speakers Included)), but I couldn't hear any sound from received both sources I tried is AV receiver preamp output (3.5mm or optical), smartphone headphone output (3.5mm), tablet headphone output (3.5mm). I contacted Revain and arranged for a refund and replacement. The second device had the same power problem. This sent sound, but the signal was heavily attenuated (very low speaker volume). When the speakers are connected via Bluetooth to a smartphone or tablet, or to an AV receiver via a 3.5mm jack, high speaker volume will drive you out of the room. The Bluetooth signal from this device is barely in the "Easy Listening" range with no way to turn it on. And the NO AUDIO DELAY feature is useless unless the bluetooth receiver is also aptX Low Latency compatible (apparently there are no monster speakers as the delay is like an echo from the back of the stadium at a distance of quarter mile sounds). I agreed to return the second block. All I need is a Bluetooth transmitter that allows me to use my AV receiver's Zone 2 preamp output with comparable performance (speaker volume) to my smartphone or tablet. It's not like this.