SENHAI Hands-Free Wired Heddset,4-Pin RJ9 Crystal Plug Head Band Headphone with Microphone for Call Center as Telemarketing,Telephone Counseling Service,Insurance Call Center,Hospitals,Bank and etc Helical headphone cable which will avoid damaging during the use. The Best Call Quality: Around 10,000 times Testing, the microphone boom rotates, 330 degree adjustable boom. Hearing protection technology, care of the user's hearing. Superior quality sound with the flexible adjustable noise cancellation microphone. Provides all day comfort, clarity and durability for Desk Telephone.