he Block Rocker is a two-way speaker with a built-in amp that has up to 12 hours of battery power and can play everything from iPods to CDs to MP3s. It’s pretty much a portable band unit, having plugs for microphones, electric guitars and keyboards! The Block Rocker even looks pretty with its sleek silver exterior and easy handle carrier; it’s perfect for the band practice or parties. Cost about 300 $ and is available at the link below. We think that the idea is good. Maybe somebody can re-design this product and use this idea better.