... the bass box technology enables stronger effect 2) Standard 3.5mm audio socket, apply with all music player and digital products ( mobile ... , MP3, MP4, PC, IPOD and other audio devices with 3.5mm socket. ) 3) New concept integrative portable mini speaker, with small bulk can ... (+-3dB)Signal&noise ratio≥80dBImpedance:4 OHM(Ω)Li-ion Input:3.7V~4.2V+0.05V Lithium battery capacity:600mAhSpeaker Unit ...