[Product size, material] 18 * 5 * 4.5cm aluminum alloy (to ensure quality) [FM] frequency range 87.5-108MHz

[Product size, material] 18 * 5 * 4.5cm aluminum alloy (to ensure quality)[FM]  frequency range 87.5-108MHz[Battery] built-in polymer battery (lithium battery) 550mAH[Output] RMS 6W (3W +3 W) THD = 10%[Frequency response] 90-20KHz (± 3dB)[SNR] ≥ 80dB[Speakers] 1.77 inches (Foreign Economic 45MM) Magnetically shielded, 4 ohm[LINE In the interface] with 3.5mm stereo plug[Enter] built-in lithium power battery, USB power cableUse the navigation keys:DC-5V: Power Charging Interface M: entrees touchLINE IN: Audio input V +: Volume lON / OFF: Power Switch V-: volume reductionSD / MMC: MICRO SD TF card interface or the interfaceUSB: Connect your computer or mobile hard disk player

Mini-stereo several features:1: to bring their own rechargeable lithium battery2: with Tuner3: The new mini-aluminum diaphragm speakers, clear treble, bass pure, unique design, sound quality is better.4: This mini stereo can be connected P3.MP4.CD.DVD.IPOD.IPHONE.GPS.PSP. Handset. Laptop. U disk. MICRO SD.6: metal casing, unique, more noble fashion, different, variety of colors, more choices.7: battery, computer USB, Power Adapter DC-5V variety of ways, so you listen to digital at any time the charm6: This card reader supports the playing speaker

mini speaker