Specifications Standard: Output Power: 1.5w x 2 (treble) + 3w x 1(bass) Impedance: 4 Ohm Signal to noise: >65dB Frequency response: 100Hz-20KHz Speaker: 2inch * 2 Power supply: DC6 Volts(AAA 1.5V X 4) or DC adapter output 6V,350mA-800mA Description: 1. This portable speaker is designed specially for travel. You can enjoy high quality stereo sound produced the portable speakers. 2. It adopted to excellent speaker unit and amplifier, processing high quality effective frequency response. 3. It can match with the IPOD,CD,MD,MP3 player, notebook computer and portable DVD the unique fold-up make easy to carry around.