Find me a manufacturer (Electrical/audio manufacturer)

Dear Sir/Madam, I'm looking to manufacture a product with the following specifications listed below. The initial order will be 50-150 units to assure the product is made correctly as well as to address any concerns. Following orders will be larger. A wireless bluetooth speaker that has a magnetic rear side so that it can attach to a magnetic surface. This device needs to be able to sync with another speaker of the same design (So the user can create a surround sound experience). This device will also need an aux cord plugin as well as a charging port. The battery needs to last a minimum of 15 hours. The size of device should be around 5.25 in long, 7.25 in high, and about 1in thick but this is negotiable (The thinner the better, however). It also needs to have a state of the art sound system so the user enjoys the experience. Some mock ups of the design are below: