B-STOCK. This is a product which has been returned by a customer within their 14-day money-back guarantee or opened by our team to test. Fully functional and come with a full warranty. --Headset microphone Transducer Type: Capacitive Working principle: pressure gradient Polar pattern: supercardioid Frequency response: - at close microphone 40 - 20,000 Hz - at far microphones: 160 - 17,000 Hz unloaded output voltage: 3.2 mV / Pa; -49.9dBV ± 3 dB Nominal impedance: about 650 ohm Load impedance:> 3500 ohm Maximum SPL at 1kHz: 144dB SPL equivalent: 37dB SPL Power supply: 780µA DC Connector: 4-pin mini XLR dimensions: - diameter 7.7 mm - length: 158 mm - weight: 32g Available in black and beige.