Specifications: model zm-rs6f. Unit type electro dynamic round type micro speaker. Frequency response 50hz ~ 20khz (extension effective). Sound pressure level 89 db +/- 3 db at 50mw. Impedance 16 ohm at 1khz. Nominal power 0.02W. maximum power 0.15W. weight 11.24Oz (316.8G) without packaging. Cord straight, triple entry 9.8Ft (300cm). Plug 3 headphone jacks ( 3.5Mm).