Helical headphone cable which will avoid damaging during the use. Hearing protection technology, care of the user's hearing. Provides all day comfort, clarity and durability for Desk Telephone. The Best Call Quality: Around 10,000 times Testing, the microphone boom rotates, 330 degree adjustable boom. Superior quality sound with the flexible adjustable noise cancellation microphone. This is high quality 4-PIN RJ9 Headphone for phone desk It is suitable for phone sales, telephone counseling services, insurance, hospitals, banks, telecom operators, enterprises etc The microphone noise abatement can reach the aviation noise reduction level. Comfortable to wear: made of the flexible metal hose with the positioning accuracy MIC + Structural Design + Durable. Direct connect over the headset headset headphone. No additional amplifiers or adapters required. Package included: 1 x 4-PIN RJ9 Headset