Nady Dual Channel Wireless 2-Microphone System - DKW-DUO HT Ideal Microphone Usage: Performance, Studio, Karaoke, Home Recording, Vocal Work, PA Systems Microphone Features: Wireless, On/Off Switch, Internal Pop Filter, Mute Button, Contoured Grip Frequency Range: 40Hz-20kHz Noise Level: 20dBA SPL Impedance: 600 ohms Sensitivity: 121dB Polar Pattern: Unidirectional Includes: Single/Dual Receiver, AC Power Adapter, Microphone Warranty Description: 90 Day Limited Manufacturer Warranty