A portable bluetooth speaker, the result of a collaboration between Fender and Teufel, has been reviewed by several outlets. The speaker, known as the Rockster Cross, has been described in various reviews, with some outlets also mentioning other models, such as the Rockster Air 2 and the Rockster Go 2. The reviews suggest that the speaker produces a big sound and has a bold design, but it is unclear which specific model is being referred to in each review.