What type of audio content can I play through the Audio Adapter HD?

Anything that you can play on regular earbuds / phone will work on Essential Audio Adapter HD. It also has a special "MQA Renderer", which enables you to play MQA Studio quality content which you can't play otherwise.

What headphones can I use with Essential Audio Adapter HD?

Any standard 3.5mm headphones.

Does it support inline buttons on my headphones?

It supports buttons of most headphones that are compatible with Android devices.

Do Essential Earphones HD work with Audio Adapter HD?

No - they are completely different products. Earphones HD are USB-C headphones which plug into the USB-C port on the phone. Essential Audio Adapter HD has a 3.5mm audio jack.

Can I use Essential Audio Adapter HD on my computer?

No.  Essential Audio Adapter HD uses a unique Click connect technology to make it very easy to connect to your PH-1.

Can I use Essential Audio Adapter HD with a stereo system?

Yes, as long as the stereo system can take input from a 3.5mm cable.

Can I use Essential Audio Adapter HD with Android devices other than PH-1?

No.  Essential Audio Adapter HD uses a unique Click connect technology to make it very easy to connect to your PH-1. 

How do I set the volume level when using Essential Audio Adapter HD?

You can change the volume using the phone's volume buttons and most headphones volume buttons.

What do the LED colors mean?

There are two colors of the LED light.  When it’s blue, it indicates that your device is playing MQA Studio master quality authenticated content.  When it’s green, your device is playing MQA Audio standard content (not authenticated by the original creator).  There will be no light when your device is playing non-MQA content or simply powers on.

What are the key differentiations of Essential Audio Adapter HD from other mobile DACs?

Essential Audio Adapter HD is the smallest and lightest of its kind on the market.  With an audiophile-grade amp, it can drive demanding high-impedance headphones. It has studio quality audio performance with high SNR and low THD+N .  Additionally, Audio Adapter HD is meant to connect to Essential Phone using Click connect technology, leaving the USB-C port free for charging. You can use it to simultaneously charge the phone and listen to high quality music.