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Facebook post by Radial Engineering Ltd.

We have some new boxes for your amp and instrument switching needs on stage! http://www.premierguitar.com/articles/24051-radial-engineering-announces-the-bumper-headlight-and-headlight-pro
Radial Engineering Announces the Bumper, Headlight, and Headlight Pro premierguitar.com

The Bumper lets you connect up to four instruments to a single guitar amp and select between them using a single footswitch.