... both work as a wired headphone and a wired speaker;5.with switches to adjust the sound volume: ... IPods, CD, DVD, TV, Radio, Home Theater Systems and so on. Product Specifications:1.Out Speaker :40hm,2.0W, Φ36 ... ×14mm,110+/-3dB2.Inner Speaker:32 ohm,0.5W,Φ40mm ... Hours :3 Hours10.Working Hours For Outter Speaker:2.5 Hours11.Audio Cord Length :55 Inches