The allelectronics ones are reported to work.

I can personally testify that they work quite well, and at $6.50 apiece, they are a real bargain. I keep one on my desk at work, along with a pair of headphones so I can listen to my empeg all day. I keep one plugged in by my computer at home so I can add music and update software. And I keep one in the carry bag I use to haul my empeg around in when it isn't in the car, along with another set of headphones just in case someone wants a demonstration and I don't have my car handy.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"