Dear CustomerWe are in line with portable speaker,which is foldable, impact, good for mp3 and other portable electronic audio devices.Our foldable design has obtained technology pattern right all over the world. If you are interested in our products please contact me freely.One of our product information FYI:108 X 86 X 23mm Magnetically ShieldedBuild-in AmplifierDrive Unit: 3"SpeakerRMS: 2W,Frequency Range: 160Hz-20KHzImpedance: 4ΩT.H.D: 0.5%Input Sensitivity: 200m Vpower supply: DC 2.5V～6VStephanieshen1atyahoo.com, our company name.netThank you and Good Luck!SincerelyStephanie
