Quality sound: The aviation headset with 24dB NRR (Noise Reduction Rating), clear Hear 50mm performance speakers Comfortable to wear: With foam ear pads, stainless steel headband and deep pocket ear canals, student pilots and flight instructors will enjoy the all day comfort Clear communication: Clear and reliable communication between crew, instructors, and the tower is critical to your flight and enjoyment Clear sound: Always be heard with the new designed EM56 noise reflective cup microphone and foam wind block mic muff Electronic noise reduction: With electronic active noise reduction and sound collection technology, this earphone provides clearer, natural sound and protection for your ears Chip protection: This headset chip is well protected by the film layer, can provide a higher defense against mold, dust and moisture High-strength material: The plug cable is made of Kraft cable and TEP cover. It has stretch, strength and frost resistance, and is not easy to age and hard Durable headband: The headband is made of the first layer of cowhide, not easy to deform and weak Specifications: NRR: 24db Impedance: 150 ohms/mono Freq: Range 100-1700Hz Sensitivity: 101db with 1mW input Volume control attenuation: 23db Microphone type: Electret noise canceling mic Freq response: 300-8,000 Hz Mic source resistance: 220-2200 ohms Compatible Walkie Talkie: For Hytera PD700 PD700G PD702 PD702G PD705 PD705G PD708 PD752 PD752G PD780 PD780G PD782 PD782G PD785 PD785G PT-580 PT580H