1.Avaiable AA battery power supply 2.Trumpet size:34X34mmX2 3.Resistance:40hms 4.Frequency range:220HZ~20KHZ 5.Cord:1.2m 6.Packing:40pcs/ctn 7.G.W:21kgs/ctn 8.Meas:40X35X60cm Fronttek,offering all kind of computer peripherals such as Mouse, Keyboard, Multimedia Speaker, Headphone, Card Reader and Digital Audio & Video products such as Mp4, PSP, DVD-T TV and Portable DVD player.