package included:<br />2 x handheld microphonesbattery not included<br />1 x receiver<br />1 x 1/4'' connecting cable<br />1 x power adapter<br />1 x english er manual<br /><br />you are looking at a dual channel wireless microphone systems.it will bring you into a world where you can sing happily and help you take off tireness and stress｣ｬfeel freely immediately!jt at home｣ｬyou can have fun with your family and friends together!<br /><br />specifications:<br />receiver:<br />1.consume power:3w<br />2.signal/noise ratio:>80db<br />3.image&spurio rejection>70db<br />4.border upon channel rejection:>70db<br />5.s/n:less than 12dbusind=20db<br />6.de-emphasis:50<br />7.power supply: ac 110v~220v.? 10% 50hz<br />8.dimensions: 7.5 x 5.5 x 1.4inch/190 x 140 x 36mmlxwxh<br /><br />microphone:<br />1.rf power output:15mwmax<br />2.spurio emissions: over 45dbcarrier ware.<br />3.microphone element: unidirctional dynamic microphone.<br />4.battery: two standard aa battery for eachincluded<br />5.current consumption: about 25ma.<br />6.battery life: over 8 hours continuo operation.<br />7.dimensions: 2.0 x 9.5inch/51 x 243mmdxl<br /><br />overall system:<br />1.carrier frequency rage: vhf 220-270mhz<br />2.frequency stability:20ppm<br />3.dynamic range:more than 80db<br />4.maximum deviation range:? 25khz<br />5.frequency response:40hz-18khz3db<br />6.audio output level:0~? 400mv mix out 0~? 200mv<br />7.t.h.d at 1khz: 0.5%<br />8.service areas:150 met