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Alpine's RUX-H02 Halo level controller lets you add a knob to your new Alpine touchscreen stereo so you can crank either the overall volume or bass like your ancestors did — with a righteous flick of the wrist. This knob not only matches the rounded-corners and beveled-edge styling of your Halo receiver, but it also attaches to its floating screen, holding the control in just the right position for handy adjustments from the driver's seat. You can control the bass just by pushing the knob in as you twist.


Easily adjust volume and bass levels right from the driver’s seat with wireless Bluetooth Low Energy connectivity for a clean, cable-free setup. Designed with Alpine’s signature Halo styling, it perfectly complements your Halo display with smooth, modern contours.
Easily mount directly to the iLX-F509 or iLX-F511, or dash-mount with other compatible receivers. A blue LED indicator shows power and pairing status, while the compact lithium battery design keeps setup simple. Enjoy intuitive operation with a smooth push-turn motion to switch between volume and bass control.

Features:
Specifications:
Good Bluetooth bass nob workers great
Its wireless features makes it more appealing although it might be a little bit expensive. Very responsive, and it allows me to adjust the volume wherever I like. One complaint is just I have to push it all over again every time before I turn on the vehicle.
It's a bit on the pricey side for just a simple knob. I've encountered some connectivity issues with it. Perhaps they should consider including it when you purchase a stereo.
Works great as expected. just a little bit expensive for what it can do