Spring design allows you to effortlessly position the microphone. Gooseneck flexes any way you please and stays in place so that its instruments. Effectively filter the noise generated vibration of the instrument, effectively improve the degree of sound reproduction and make the performance perfect. This microphone is designed instruments saxphone, wireless connections, plug. Material : Plastic Receiver : Frequency : 660 - 690Mhz Channel : 16 Receiver Sensitivity :- 94dBm Frequency Response : 80Hz - 15KHz ± 3dB Plug : 6.1 Piece Microphone 1 Piece Receiver. Please allow slight dimension difference due to different manual measurement. People always bought together with.