UltraDisk Lapel Lavalier Tie Clip Microphones are of the electret type microphone. This type of cardiod electret condenser microphone, eliminates the need for a polarizing power supply by using a permanently charged material. High quality connections perfect for use with PC Laptops, VOIP, Skype, Podcasting, External webcam microphones and wireless bodypack transmitters to achieve an all round high quality audio recording. Perfect for use in interviews, dictation, theatre and stage performance, sampling sound bites or using as a high quality microphone with Dragon Naturally Speaking Voice to text software. UltraDisk microphones are commonly used as vocal or speech microphones, since they are ideal for rejecting sounds from other directions. In three dimensions, the UltraDIsk unidirectional cardioid mic is shaped like an apple centred around the microphone which is the "stalk" of the apple. The cardioid response reduces pickup from the side and rear, helping to avoid feedback and improve recording quality.