The amazing Double Bass burger is a set of stylish, ultra portable stereo speakers that pop-up to pump out a great sound way beyond their tiny 2-Inch (5cm) size. Using the same patented ‘Vacuum Bass’ technology developed for its acclaimed single brother, the BassBurger. A simple twist will expand the vacuum enabling it to resonate & produce a truly impressive 2.0 stereo sound with bass unlike any other portable speakers. It snaps together with internal magnets so can be operated as a compact single unit when travelling or divide it into separate speakers to get the full benefit of its awesome stereo sound. The Double Bass burger has its own adjustable volume control & rechargeable lithium-ion battery inbuilt allowing it to pump out the tunes for over 10 hours and be recharged in less than 3 (via USB). It can be used with any audio player that has a standard 3.5mm headphone socket, making it the ideal portable speaker system for your laptop, mp3, iPod, iPhone or hand held gaming console. Constructed from a tough & durable soft-touch material the palm-sized audio will be supersonic music to your ears. Forget the tinny sound you get from other portable speakers and feel the bass with the Moki Double Bass burger. Specifications: Speaker :1.7W x 2 Sensitivity : >80dB, Rated Power : Frequency Response: 280Hz to 16 kHz, Battery Input : DC 5V , Charge Voltage: 5V , Play Time - Approx 10 hrs, Charge Time USB-about 2.5 -3 hrs , Dimensions: D 55mm x 55mm x 77mm, Weight : 112g