Grain Audio and HeadCount have teamed up to offer 12 hand-signed Grain Audio Packable Wireless Systems from the likes of Willie Nelson, Bob Weir, Trey Anastasio, Jack Johnson, Gary Clark Jr., Warren Haynes, Grace Potter, The Disco Biscuits & Mickey Hart and Bill Kreutzmann, Moby, Jeff Tweedy, Derek Trucks & Susan Tedeschi and Dave Schools & John Bell. All items are available via an online auction here.

The Grain Audio PWS.01 is a portable battery-powered speaker that connects with any Bluetooth-enabled product.

Proceeds from the auction will go directly to benefit HeadCount’s efforts to encourage active participation in the democratic process. All items will be available to bid on beginning tomorrow, with the auctions closing on December 15.