Thanks for your visiting this portable voice amplifier megaphone. This simple design has very low noise， close to the theoretical minimum. It is will meet your expectations. Beautiful in small bodily form and easy to carry make it a wonderful aid for various activities， effective avoiding of interference while being used outdoors powered by either rechargeable battery or external power. All in all， it is time to try this portable voice amplifier megaphone.                                    Features                New ang high quality<br>    This speaker system is good for use at the car， motorcycle， etc<br>    Good workmanship<br>    Loud sound and clear tone quality<br>    Easy installtion<br>    Work for iPod， CD player， MP3 / MP4 / MP5 player， etc<br>                                                            Specifications                        Maximum Power     150W    <br>          Nominal Power     12W    <br>          Woofer Size     脦娄100mm    <br>          Mylar Dome Tweeter Size     脦娄 28mm    <br>          Sensitivity     88dB / W (1M)    <br>          Frequency Response     65Hz~22KHz    <br>          Impedance     4 ohms    <br>          Color     Balck    <br>          Dimension     13.5 x 13.5 x 5 x 6.9cm / 5.31" x 5.31" x 1.97" x 6.09" (L x W x H x Dia.)    <br>          Weight     955g / 33.69oz    <br>                                                             Package Includes                1 x 150 Watt 4 Inch 2-Way Coaxial Car Speaker Black<br>