Fone gamer usb dex df-55 Fone de ouvido usb c/microfone e controle multimidia frequency response: 20hz20khz impedance: 32o driver unit: 40mm rated power: 20mw power handling capability: 100mw sensitivity:108db length of cable:2.2m microfhone:6x5mm-58db+/--2db plug: usb2.0 port (plug&play)Ref.687