Main function and features: Supports SD card and USB disk, automatically read the first audio device you insert With AUX IN Compatible with MP3 and MP4 players, Apple's iPod, laptop, CD player and PC With FM radio function Frequency range: FM: 76 to 108MHz Excellent tone quality, with wallyson dual channel stereo Dual power supply, built-in rechargeable lithium battery and USB power Convenient for travel, portable, super slim and mini size, easy to carry Material: pure ABS, metal loudspeaker net Technical specifications: Output: 3W x 2 Frequency range: 100Hz to 20KHz Impedance: 4Ω Power voltage: USB/5V DC, 1A SNR: >90db Speaker unit: 52mm x 2 Accessory: audio cable, USB cable, lanyard, lithium battery and manual iPod is a trademark of Apple Inc.