Main Features:<br />BOYA BY-LM20 Lavalier microphone mini USB adapter<br />Clip-on mic for GoPro Hero 3+ / 3 / 2， camcorder etc.<br />Omni directional condenser microphone<br />High quality mic is ideal for video use<br /><br />Specification:<br />Transducer: Electret condenser<br />Polar pattern: Omni-directional<br />Frequency range: 35Hz - 18KHz<br />Signal / noise: 74dB SPL<br />Sensitivity: - 30dB + / -3dB / 0dB = 1V / Pa， 1KHz<br />Connector: 3.5mm plug， mini USB plug<br /><br />Cable length:<br />Microphone: 1.2m ( 47 inches )<br />Mic adapter: 11cm ( 4.3 inches )<br /><br />Note:<br />The camera showed in the picture is not included. <br /><br /><br /><br /><br /><br /><br />    Specifications<br />General<br />	 Apply to Brand : Gopro                                                  <br />                        Compatible with : Gopro Hero 3， Gopro Hero 2， Gopro Hero 3 Plus                                                  <br />                        Accessory Type: Microphone， USB Cable                                                	<br />Dimension and Weight<br />	 Product Weight : 0.025 kg                                                  <br />                        Package Weight : 0.074 kg                                                  <br />                        Package Size (L x W x H): 8.9 x 2.7 x 14 cm / 3.50 x 1.06 x 5.50 inches                                                	<br />Package Contents<br />	 Package Contents: 1 x BOYA BY-LM20 Lavalier Microphone， 1 x Mini USB Adapter                                                	<br /><br /><br /><br />                                                <br />