1.The speaker unit :22.output power: 3 W x 2 (RMS)3.frequency response range: 150 hz ~ 20 KHZ4.impedance: 600 or more �� manic ratio: 65 db or higher5.distortion rate: < 1%6.Material: ABS.7.size (mm) : 250 * 70 * 65 mm8.weight about 393 g9.I/O: audio input: bluetooth + card/U disk / 3.5 mm audio input (AES/the EBU)10.Battery life time: 4 hours or more (average volume)11.operating functions (key) : add and subtract "+ -" mode， volume， music， play， pause， up and down