All new, specially designed, in-house manufactured, ceramic drivers able to deliver amazing clarity, warm bass and impressive sound levels. * Extended battery now lasts 18 hrs up from 10 hrs in the X-Mini II * Compatible with mobile phones, tablets, various multi-media devices. Basically, Anything with a standard headphone jack! * BXS Bass expansion system which greatly increases the amount of bass possible in such a small speaker. * Micro USB charging for ultimate flexibility.