The item is a compact, lightweight portable headset microphone. Looking at its small size you&rsquo;d be surprised at how it is, make it perfect for guiding people through noisy, busy environments, or ensure that you&rsquo;re heard in large groups or crowds. Features - Small volume, light weight, easy to carry; Connection plug: 3.5mm (bend). - Connect loudspeaker, laptop microphone’s interface directly; The sound recording is clear. - The microphone arms can bend, adjust the position. - It is suitable for applications such as teaching, & visiting, present performance and in store supermarket or flow stand. Specification - Color: Black. - Material: ABS. - Size: 16 * 14 * 3.5cm(L * W * H). - Mic Dimensions: &Phi;9.7×5.0mm. - Sensitivity: -52dB&plusmn;2dB. - Impedance: <=680&Omega;. - Working voltage: 1. -1 . - Frequency Range: 20-20kHz. - SNR:Above 55dB. - lnput plug Diameter:3.5 mm 100 cm braided wire. Package list: 1 * Multifunction Loudspeaker Microphone Portable Voice Amplifier for Teachers Saleman