We appreciate the inclusion of a physical on/off button, but many of these adapters don’t have one. We evaluated the size, placement, and sensitivity of the buttons, as well as whether they controlled our devices the way we wanted them to.
Button controls: Since none of these Bluetooth audio receivers let you use the inline remote on headphones, intuitive controls are a must. Unfortunately, many of these cheap headphone adapters don’t specify which Bluetooth codecs they support our assumption is that they support only the basic SBC codec unless their specs state otherwise. For more details, read our blog post about Bluetooth codecs and how they affect sound quality. The sound quality depends on the receiver’s built-in digital-to-analog converter (DAC) and its other audio circuitry, as well as what audio codecs the device supports. Audio quality: A Bluetooth audio receiver should ideally sound as good as a direct, wired connection, so we immediately dismissed any adapter that audibly changed the sound. We also noted which devices provided helpful visual or audible cues to indicate Bluetooth pairing, connection, and disconnection. 
Most of the adapters we tested can connect wirelessly to two devices at the same time, and we tested how simple it was to switch between those devices. Its connection should be strong enough to play audio without frequent skips and pauses, even if you’re charging the source device across the room or if you have to walk to a nearby room with your headphones on.
A Bluetooth headphone adapter should be easy to pair with your device. Easy, reliable wireless connectivity: Listening to music wirelessly isn’t all that convenient if the connection is hard to establish and maintain.
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