singel din HU with ability to lock out features

[shake this 10+ year member]

Need a HU that has a feature that allows eq settings and other functions (bass, treble) to be locked out, preventing users to be able to adjust without a passcode.

I know some of the higher model number double din DVD units from Kenwood has the feature but I’d like a singe din CD HU with front panel AUX input, any suggestions. I’d just search but this feature normally isn’t listed in the basic descriptions.

Need this for the greyhound bus build so the customers don't jack up the sound. I'm having the problem with this happening on the smaller bus we did.

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