„Rock-it“ – small thing, which can turn anything into a speaker.  Connect your headphone connector to the sound source (eg, phone) then stick this small speaker to things (eg, boxes or picture) and it will turn it into a massive sound source, and you will be able to listen music much louder. The larger the object is, and the more “rock-it” you use, the louder the sound will be. In this site you can buy the product for $ 20. In Amazon $ 12,99.

The Rock-It portable vibration speaker system takes music from your device and turns it into vibration sequences. It sends those vibrations through the Rock-It pod which sticks to ANY object. Simply press play on your device and the Rock-It will turn that object into a speaker! Now with a built-in rechargeable battery!