... : DC 5 Volt (li-lon Battery inside) USB power cord* Output Power: 3w+3w* Driver Unit: 52mm speaker , 4ohms* Frequency Response ... : 150-18KhzPacking:* Packing Content: Speaker, remote control,USB Power Cord,2.5mm docking, nuokia docking,sony docking,2 head ... more pure and stronger. embedded type lithium batteries can use or power adapter for charge, more convenient and use-friendly, cost- ...