For Hytera PD708/PD752/PD752G/PD780/PD780G Aviation Pilot Headphone Two Way Radio Headset with U94 PTT Adapter •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 Compatible with: •Hytera PD780 Package included: •1 x U94 PTT Headset Adapter •1 x Headset