Portable Multimedia Digital Speaker RT-02A

Features:
-Small and lightweight, you can take this portable speaker in your pocket
-This USB speaker could provide you ultra-portable mini stereo system
-Enjoy your music without headsets or large wires for external speakers
-Power by plugging the USB power cable into virtually any USB port, or by connecting to the AC wall outlet adapter(adapter not included)
-No recharging function, only work through USB port Suitable for PC, MP3, MP4, laptop computer

Descriptions:
-Cabinet Material: Plastic
-Communication: Wired 3.5mm plug and USB interface power

Special Feature:
-Portable, Mini Use: Portable Audio Player

Specification:
-Input Power: USB DC 5V
– Speaker Dimension & Impedance: 4?
-Output Power: 5W
-Frequency Response: 90Hz-20kHz
-Sensitivity: 80dB+-2dB
-SNR >= 80 dB