I bought a monitor hp model number 21kd and it needs a cable for volume which cable model number do i buy and can i get it online shopping thanks

I dont know you will have to call them

How do I know?, I don't work there. You would have to Google or talk to someone there with knowledge. Sorry

The best and fastest ways to call your local Best Buy to give them the exact specs you will need. But I guarantee you they will have whatever you need. And they usually have more online than in the store. Cheers