The TOA WH-4000A and the WH-4000H are a headset microphone of a cardioid pick-up pattern.The WH-4000A features sweat-proof design with an adjustable fixing band exclusively designed for aerobicsinstructors. The WH-4000H is suitable for speech reinforcement applications. Item Value Type Electret condenser type Directivity Unidirectional Sensitivity –66 dB ¡¾3 dB (0 dB = 1 V/0.1 pa, 1 kHz) Maximum Input Level 120 dB SPL Terminal ©ª3.5 mm plug Cord Length 1.3 m Finish Frame : Stainless, black (silicon rubber)Gooseneck : Iron, chrome-plated, black (shrink tube) Weight 50 g (cable included) Applicable Model(option) UHF wireless microphone : WM-4310HCompacat Megaphone : ER-604W