# Car Stereo Volume Knob Kit - RE_SWC
A plug-and-play volume knob kit for your car
- **Seller:** [Pounamu Electronics](https://lectronz.com/stores/pounamu-electronics), Auckland, New Zealand
- **Price:** $30.00 (USD, before shipping and taxes)
- **Availability:** Sold out
- **Categories:** Kits, Technology, Audio
- **Country of origin:** New Zealand
- **HS code:** 8518908100
- **Product page:** https://lectronz.com/products/car-stereo-volume-knob-kit-re_swc
## Options
**Volume Knob Cover/Cap**
- No Volume Knob Cover/Cap thanks
- 1pc Large Aluminium Volume Knob Cover/Cap (20x14mm black) [Add $5.00] (32 left)
- 1pc Small Aluminium Volume Knob Cover/Cap (12x15mm black) [Add $5.00] (14 left)
**SWC Patch Cable**
- Just the standard bare wire patch cable (unterminated) (190 left)
- 3.5mm Terminated SWC Patch Cable [Add $5.00] (148 left)
**3.5mm SWC Splitter**
- No 3.5mm Splitter thanks
- 3.5mm SWC Splitter (74 left)
**USB C to A Cable**
- No USB C to A cable thanks
- 0.5m Braided USB C to A Cable (Data + Power) [Add $3.50] (75 left)
**USB Splitter**
- No USB Splitter thanks
- USB Data and Power Splitter Cable [Add $5.00] (231 left)
**I have confirmed this is compatible with my headunit**
- My headunit uses resistive learning SWC
- I have a JVC Headunit
- I have a Kenwood Headunit
- I have an Alpine Headunit
- I have a Pioneer Headunit
- I have a headunit using USB HID control
- I have a Sony Headunit
- I am unsure if my headunit is compatible
## Links
- [Documentation](https://github.com/pounamu-electronics/RE_SWC/tree/main/Docs)
- [Code](https://github.com/pounamu-electronics/RE_SWC_FW)
- [Design Files](https://github.com/pounamu-electronics/RE_SWC)
## Images
## Description
*Another release of stock will be available 8th October 9am NZST. Join the Lectronz waitlist to be notified as soon as the kits are available for purchase!*
#### *US Customers*
Please ignore the generic shipping warnings from Lectronz regarding tariffs and delays in shipments. All volume knob kits are shipped from us with tariffs pre-paid (the tariff is included in the shipping cost) resulting in no delays and no border clearance issues
### Features:
- Simple, **plug-and-play** solution
- Compatible with major headunit brands
- JVC1
- Kenwood2
- Alpine
- Pioneer
- Android Headunits (solderless control via USB!)3
- Sony
- Any headunit with resistive steering wheel control learning
- **Remapable inputs** using the [Configurator Tool](https://pounamu-electronics.github.io/)
- **5V USB powered**. Plug directly into your headunit for power. No Soldering
- Fully **open source** hardware and firmware. This includes all design files, BOM, firmware, etc
1 JVC forces incremental volume control above certain values on select models. I am yet to find a way to bypass this.
2 Kenwood forces incremental volume control above certain values on select models. I have found a way to bypass this and have implemented it by default in the firmware. This may or may not work for your unit and your miles may vary.
3 Some Android headunits do not allow USB volume control. If that is the case with your unit, you can default back to using the resistance SWC mode of this kit for control input
### Known Issues
- (27/08/2026) DMX-8710S slow to respond to inputs from Volume Knob Kit. Most likely due to Kenwood FW implementation as the unit is also slow to respond to its own volume touch buttons
- (15/09/2026) Cannot be used in parallel with Maestro RR/RR2 on Sony XAV-AX6000, XAV-AX3700. Most likely will not work in parallel with Maestro Modules on Sony units
### RESWC Impact Map
Check out where our volume knob kits are in use around the world! >> [RESWC Impact Map](https://www.google.com/maps/d/edit?mid=1JDZoqSFC2vp5jECxEuNOUrSM_snK-p8&usp=sharing) <<
### What's in the box:
- 1pc Volume Knob Kit - includes controller board, encoder board and required connectors/cables
### Optional Accessories:
- Black Aluminium volume knob cover/cap (large and small)
- 0.5m Braided USB C to A cable (data & power)
- 3.5mm jack pre-terminated SWC patch connector
- 3.5mm Steering Wheel Control (SWC) Input Splitter: Wire your OEM steering wheel control adapter in parallel with the Volume Knob Kit. No wire stripping, no soldering, easy installation
- USB Splitter: Power the volume knob kit while running wired Android Auto or Carplay through a single USB port on your headunit
### Default SWC Outputs
| INPUT | OUTPUT |
| :-----------------: | :------------: |
| Volume Knob CW | Volume + |
| Volume Knob CCW | Volume - |
| Button Short Press | Mute |
| Button Long Press | Next Track |
| Button Double Press (Gen. Resistive Mode) | Enable Learning Mode |
| Button Double Press (Other Modes) | Previous Track |
### Remapping Outputs
Your kit can be configured on the fly! Use the [Volume Knob Kit Configurator Tool](https://pounamu-electronics.github.io/) and truly make your Volume Knob Kit your own. Map all the inputs to any of the supported outputs.
### Documentation and Source Code
- [User Guide](https://github.com/pounamu-electronics/RE_SWC/tree/main/Docs)
- [Video Demos](https://www.youtube.com/@pounamu_electronics)
- [Hardware Documentation and Source](https://github.com/pounamu-electronics/RE_SWC)
- [Firmware Source](https://github.com/pounamu-electronics/RE_SWC_FW)
### Is this just as good as a volume knob built into my stereo?
Unfortunately, no. The knob built into car stereos control the "absolute" volume and allows for cool functions such as acceleration of the volume when you really wrench on the knob.
This kit taps into your car stereo's steering wheel control input. Using this input, the Volume Knob Kit can only request volume increments or decrements at a pre-defined rate (dependent on the protocol overhead of each brand).
We have tuned the encoder and Microcontroller for this product to be as responsive as possible to your input! If you are not happy with the end result, let us know and we will action a response asap!
### Shipping
Please note, the price of this item is exclusive of GST and/or VAT etc. Any import taxes and duties shall be borne by the customer.
- Note: Only US shipping price includes prepaid tariffs (DDP) as this must be paid by us on behalf of you before shipping
- NZ customers: We are Auckland based (Rosedale). If you would like to pick up your order, please let us know beforehand and we can provide you a free pick up option with the site!
### Warranty and Returns
We will happily accept warranty claims for products that are DOA. If your headunit ends up being incompatible, we will also happily provide a refund. Buyer's remorse will not be warrantied or refundable.
### Compliance
#### FCC Compliance Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. this device must accept any interference received, including interference that may cause undesired operation.
#### New Zealand and Australia
This device is compliant with the following standards:
1. AS/NZS CISPR 32:2015 AMD 1:2020
## Shipping policy
We ship worldwide unless explicity stated.
Import taxes and/or tariffs to be borne by the customer unless explicitly stated.
All US orders are shipped with tariffs pre-paid. There will be no delays or extra payments during shipping.