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 qualityThis speaker system is good for use at the car， motorcycle， etcGood workmanshipLoud sound and clear tone qualityEasy installtionWork for iPod， CD player， MP3 / MP4 / MP5 player， etc                                                            Specifications            Maximum Power    400W    <br>Nominal Power    25W    <br>Woofer Size    Φ160mm    <br>Mylar Dome Tweeter Size    Φ28mm<br>    <br>Sensitivity    90dB / W (1M)    <br>Frequency Response    45Hz~22KHz    <br>Impedance    4 ohms    <br>Material    Heat - resistant resin    <br>Color    Balck    <br>Dimensions    18 x 18 x 8 x 7.8cm / 7.09" x 7.09" x 3.14" x 3.07" (L x W x H x Dia.)    <br>Weight    1412g / 49.81oz    <br>                                                            Package Includes            2x 400 Watt 6.5 Inch 2-Way Coaxial Car Speaker Black