It can make your sounds more louder.
<br />It can work with MP3, MP4, cell phone, and computer via the audio cable
<br />With headmount microphone.
<br />Built-in rechargeable battery, long battery life, about 15-20 hours working time (full power state)
<br />High quality, good frequency response.
<br />Comes with a strap, can be worn at the waist.
<br />Compact, portable size. 
<br />
<br />Package Content:
<br />1 x Loudspeaker 
<br />1 x Power Adapter 
<br />1 x Microphone
<br />1 x Strap
<br />1 x Audio Cable
<br />1 x User's Manual
<br />Features:
<br />100% brand new, high quality.
<br />It can make your sounds more louder.
<br />It can work with MP3, MP4, cell phone, and computer via the audio cable
<br />With headmount microphone.
<br />Built-in rechargeable battery, long battery life, about 15-20 hours working time (full power state)
<br />High quality, good frequency response.
<br />Comes with a strap, can be worn at the waist.
<br />Compact, portable size.
<br />Suitable for teacher teaching, tour guide, public speaking, etc.
<br />
<br />Specifications:
<br />Color: Black
<br />Shell material: Plastic
<br />Dimensions: 10.5*8.5*4.2cm (L*W*H)
<br />Battery: Built-in 7.4V lithium battery
<br />Power supply: Input AC 100V-240V 50/60Hz; Output DC 10V 350mA
<br />Output power: Max. 20W
<br />Frequency response: 100Hz-13KHz 3db 
<br />Charging time: about 3-4 hours
<br />Working time: about 15-20 hours (full power state)
<br />Use: Please put the microphone pointed at your month about 20-30mm.
<br />
<br />Indicator: 
<br />If the green LED dims out gradually, it indicates that the battery is low. 
<br />When charging, the LED will flash in red and green. 
<br />If the LED turns green, it indicates that the battery is fully charged.