NIB TRIPRO 4-Pin RJ9 Telephone Headset for Landline Desk Phones (H510-RJ)

NIB TRIPRO 4-Pin RJ9 Telephone Headset for Landline Desk Phones (H510-RJ) Keep your hands off the phone using this headset. You can increase productivity by working on your computer, taking notes, and handling other tasks - hands-free - while talking to your customers. Enjoy the benefits of completing calls faster and with less likelihood of errors. This headset model offers a substantial increase in comfort and productivity over a handset. The most cost-effective headset solution. Specification: 1500hms speaker, to ensure the perfect voice quality Microphone type: electret condenser microphone (ECM) Microphone sensitivity: 40db‡3db Microphone voltage: 2.0v Receiver impedance: 150‡10db ohm Package Included: 1 x 4-Pin RJ9 Crystal Monaural Headset 1 x Headset Adapter NOTE: If you can not hear or others can not hear you, please try to adjust the adapter.