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Description:Features: 1) Impedance: 40Ω 2) Frequency response: 275Hz - 20kHz 3) Power output: 3W 4) Power requirement: DC 3.0V (2 x AA batteries) 5) Battery life: up to 7h 6) Cord length: 250mm 7) Plug: 3.5mm stereo (L-shaped)