Launched 11 November 2026

Home Assistant Connect AUX-2

Home Assistant Connect AUX-2 on a blue background

Home Assistant Connect AUX-2 streams lossless audio, controls devices over serial, is a Bluetooth hub, and lets you put your Z-Wave adapter in the best spot in your home.

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Available to buy now

Made by Nabu Casa

Every AUX-2 sold helps fund Home Assistant's development.

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Specs

Model
NC-AUX-9758
Ports
USB-A, two serial (RS-232), Grove, audio out
Audio
3.5 mm output
Network
Ethernet or 2.4 GHz Wi-Fi
Power
USB-C (5 V, 2 A) or PoE (802.3af or better)
Requires
Home Assistant 2026.9 or later
The Connect AUX-2 circuit board

Resources

FAQ

Does Connect AUX-2 require Home Assistant to work?

Yes. Connect AUX-2 is built to be a native Home Assistant device to give you full local control and privacy. To take advantage of these benefits, you'll need to run Home Assistant 2026.9 or later to setup and manage your system, and it will be added to the ESPHome integration.

Set up Home Assistant Connect AUX-2

Does it have an audio input?

No. Connect AUX-2 has been designed to play music rather than receive it, so only has an audio output.

What Connect AUX-2 is and how it works

Can it send or receive Bluetooth audio?

No. Audio plays only through the 3.5 mm audio output.

Specifications and resources: Audio

Does Connect AUX-2 come with any audio or serial cables?

No. Audio setups vary widely, from 3.5 mm AUX and RCA to dedicated RS-232 serial connections. Buying cables separately lets you choose the exact length and connector type that fits your equipment. See In the box for what’s included.

What's in the box

Does it work with every device that uses serial?

No. It can only control serial devices that have an integration in Home Assistant.

Controlling devices over serial (RS-232)

Can AUX-2 connect with Zigbee devices?

Yes, but we recommend caution. This setup hasn’t been widely tested yet, and the setup guide is in the developer documentation. It works only with ZHA, not Zigbee2MQTT, and needs Home Assistant 2026.11 or later.

ZBT-2 setup guide (developer section)

Can it connect Thread devices?

No. Thread connectivity isn't planned for Connect AUX-2.

Specifications and resources: Connectivity

What app do I use to play music?

Music Assistant, which is free. It discovers Connect AUX-2 automatically as a Sendspin player.

Install Music Assistant

Which streaming services are supported?

Any service that Music Assistant supports. Music Assistant plays from streaming services and from your own music files.

Music Assistant music sources

How do I connect AUX-2 with my existing stereo or speakers?

With any stereo, AV receiver, or powered speakers that have an auxiliary input. It doesn’t amplify, so unpowered speakers need an audio amplifier.

Play your streaming services on your stereo

Can it play in sync with my other speakers?

Yes. Music Assistant can group speakers to play in sync, including AirPlay and some Sonos speakers.

Music Assistant groups

How is it powered?

By USB-C (5 V, 2 A) or Power over Ethernet (802.3af or better), one source at a time.

Power and network options

Does AUX-2 connect via Wi-Fi or Ethernet?

Either one. Wi-Fi is 2.4 GHz only. Wired is recommended for the most reliable link.

Power and network options

Can Home Assistant turn on my receiver or change its volume?

Yes, if the receiver has an RS-232 serial port and a Home Assistant integration.

Control your TV and AV receiver from Home Assistant