La description

Features:
1/ Wireless, Portable, Mini
2/ Dynamic internal magnetic
3/ with SD/MMC Card useful function
4/ Lithium battery, USB Charge power
5/ Audio Line In with various player devices by 3.5” plug
6/ Audio Input, Output
7/ Function Switch: Pause, next/previous,Power on/off,V+,
   V-,V-out, V-in, USB power

Specification:
1/ output power:3W
2/ Frequency response:**0HZ**8KHZ
3/ Speaker: *0mm,4 Ohms
4/ Li-ion Input: 3.7V  **0mAh
5/ Li-ion output:4.2v,+/*0.*5v
6/ Humidity Test: ****5% RH *4H
7/ Heat test: ****-**5℃
8/ RF:**0Hz±*0%
9/ S/N Ratio: *5dB±3dB
*0/ DCR(Direct Currency Rated Impedance): 3.2Ω± 5%
*1/ Body size: *6(Full Height)x*0(Dia.)mm,  *0(Close Height)x*0(Dia.)
*2/ color box: 7x7x6cm  Carton size: *7(L)x*0(W)x*3(H)cm ,**0pcs/ctn   N.W / G.W: *0 /*1.5kgs/ctn.