Product Name: Flight Aviation Headset with Passive Noise Attenuation Model NO.: headset Jack Type: Plug-in Jack Diameter: Two Sizes Function: Microphone, Noise-Cancelling Usage: Aviation, Telephone, Workstation, Server, Helicopter Type: Electret Earphone Color: Black Wire Material: TPE Support Network: Ethernet Information Content: Voice Certification: GS, Ce, RoHS, ISO Condition: New Trademark: flight Transport Package: 1PC/Box, 12PCS/Carton Specification: SGS, BV Origin: Guangdong, China HS Code: 851830 Product Description Earcups of high-density acoustic foam for best passive noise attenuationHas noise reduction rating (NRR)High fidelity speakers for clear, natural soundElectret, noise-canceling flex-boom microphone reduces background noise and allows clearest voice transmissionGold-plated microphone and headphone plugs ensure best connection and resist corrosionHigh-grade, multi-strand wire improves cable lifeStereo/mono capabilityLarge, dual controls for quick, easy volume adjustment of each earMicrophone muffAdjustable headband with easy thumb screws eliminates "hot spots" and accommodates eyeglasses and any head sizeQuality foam ear seals and light weight add to overall comfortSleek, all-black designSturdy and reliable - yet reasonably priced for maximum value.1, Adjust the headband to make it fit you.2, Wear the headset, and adjust the headband again, also adjust the earpad position till you feel the noise reduction function is the best.3, Move the microphone 5-10mm distance from your lip.4, Insert the microphone (5.23mm) and speaker (6.35mm) plug to the corresponding jack.5, Turn on the equipment for this headset.Attention:1, It's important to wear the headset well, as that will directly affect the noise reduction effect.2, Maintenance and CleanessDo not tear apart it by yourself.If you found something unnormal, please stop to use it.Please keep the headset clean by wiping it with soapy water. 3,Do not dip it into water.4,Do not clean it by chemical.SpecificationsNoise Reduction Ratings(NRR):24dBHeadphoneType:Dynamic (Φ40)Frequency Response: 100Hz to 8KHzSensitivity:95±5 dB SPL (1 kHz, 1 mW input per earcup side)full volume on ear simulatorImpedance: 150 ohms/mono,300 ohms/stereoRate Input:10mWMax. Iuput: 100mWMicrophone and AmplifierElement Type: Electret Noise-canceling Frequency Response: 100Hz to 8kHzOperating Voltage: 8-32 Volts DCMatching Impedance: 150-2200 ohmsSensitivity: -28±4 dB GeneralTemperature:Operating: - 20 to 70°CCordage:Straight cord from headset to molded plug, 150CMIntercom Connections:Earphone Plug: Φ6.3 phone plugMicrophone Plug: Φ5.2 phone plugWeights: 470gHeadset size rangeHeight: 10 to 14 cmColor: BlackBoom:Flexible Boom