Compatible with most of the desk phones except Cisco phones.【NOT for mobile phones and Computers】The QD headset with two QD-RJ09 cables are compatible with desk phones like Snom,Aastra,Mitel,ShoreTel,Polycom,Sangoma,Fanvil,Grandstream,Yealink,Digium,NEC,Toshiba,Nortel,etc. | Excellent sound quality: The telephone RJ09 headset with HD audio is perfect for the communication, noise-cancelling microphone are ideal for noisy work environments. | All-day comfort: This call center headphone with large soft leatherette ear cushions and lightweight design ensure all-day comfort wearing. Adjustable headband is suitable for different head sizes and 300 degree rotatable microphone boom enables you to find perfect fit. | Durable Corded Headset: The headset with stainless headband, superior quality microphone is good for the contact centers, office,Telemarketing,customer service, Insurance, Hospitals, Banks etc. Compete with Plantronics or Jabra phone headsets. | Professional Office headset: This headset and RJ09 Cables have quick disconnect plug , the cables also can be compatible with Plantronic headset.Comfortable monaural headset for people who prefer to leave one ear open. We promise 2 years’ warranty, any question about compatibility, pls feel free to send us message.we’ll try to reply you within 24 hours ASAP.