[Function]: The headset adapter can connect 3.5mm headsets to 2.5mm telephones, allowing you to use your headphone or other devices with a 3.5mm plug on your 2.5mm devices. | [Compatibility for 3.5mm Female Jack]: Suitable for most devices with a standard 3.5mm plug like cell phone headset, headphone, earphone, etc. (NOT COMPATIBLE WITH IPHONE EARPHONE) | [Compatibility for 2.5MM Male Plug]: Compatible with most Panasonic Cordless Dect phones and AT&T VTech RCA Uniden Cisco Linksys SPA Clarity Zultys Gigaset Cortelco landline phones with a standard 2.5mm headset jack. | [Plug and Play]: This audio cable, 3.9inch/9.8cm, allows all functions on the headset and phone to be used synchronously. Easy to plug and play. | [Warranty & Note]: 45 days money back & 1 year worry-free guarantee. Only compatible with some specific phones with a 2.5mm headset jack. Please check the compatibility of your devices before purchasing. For compatibility list in details, please refer to description below.

【Compatible with Plantronics QD Headsets】: This headset cable is compatible with All Plantronics Quick Disconnect (QD) headsets and other headsets with the same QD connector. Great headset cable replacement of Plantronics 2.5mm Adapter. NOT for Jabra GN Headsets. | 【2.5mm Jack Phone Compatibility】: This 2.5mm headset adapter is ONLY Compatible with AT&T ML17929 VTech Panasonic Dect 6.0 Uniden RCA Cisco Linksys SPA Grandstream Zultys Gigaset Polycom Office landline and cordless phones with standard 2.5mm headset jack. NOTE: NOT COMPATIBLE with 3.5mm headphone jacks in Cell Phones and Computers. | 【Super Long & Ultra Durable】: The length is 68 inches/5.7 feet before stretching, 80 inches/6.7 feet after stretching. This QD to 2.5mm cable provides the rational length for connecting a QD headset to a telephone and facilitates talking anytime. Coiled cable with spring wire design, free from knotting or twining, durable and strong. | 【Easy to Connect】: Plug and play, simple to use. It only takes 2 steps to use: Plug the 2.5mm Jack to the headset port of your phone; Connect QD Adapter to your headset port. QD feature enables you to walk away from the desk without taking headset off and keeping call still remains. It's a practical and good companion for business, make your work easier. | 【1-Year Warranty & Compatibility Notes】: We offer 45 days money back & 1 year worry-free guarantee. ONLY COMPATIBLE with some specific phone models with standard 2.5MM Headset Jack listed in description (include but not limited). DO NOT buy it for smartphones and laptops. For other phones, please consult us for Compatibility Guide or Advice.

【Compatible with Plantronics QD Headsets】: This headset adapter is compatible with All Plantronics Quick Disconnect (QD) headsets and other headsets with the same QD connector, alternative to Plantronics U10P/HIC 27190-01 adapter cable. NOT for Jabra GN Headsets. | 【RJ9 Jack Telephone Compatibility】: ONLY compatible with some specific landline phone models, including Polycom SoundPoint 300 301 335 430 450 500 (rev. E or later) 501 550 600 601 650 670 CX300 CX500 CX600 CX700 VVX300 VVX310 VVX400 VVX410 VVX500 VVX600 VVX1500, Plantronics, ShoreTel, Avaya / Lucent, NEC, Toshiba, Mitel, Aastra, Zultys, Nortel, Siemens or ROLM, Inter-Tel, Allworx, Digium, etc. Please check the compatibility in the description before purchasing. NOT FOR CELL PHONES OR COMPUTERS. | 【Easy to Connect】: Plug and play. It only takes 2 steps to use: Connect this QD Adapter to the QD port of your headset; Plug the RJ9 Jack to the headset port of your phone. QD feature enables you to walk away from the desk without taking your headset off and keeping call still remains. Ideal for Call Center, Office, Home, Hospital, Insurance, Business, School, Bank, Telephone Counselling Service. | 【Adjustable & Durable】:The standard length is approximately 68inches/5.7ft, the stretched length is approximately 80inches/6.7ft. Coiled design of this flexible qd to rj adapter cable provides the perfect length for connecting a QD headset to a landline phone. Retractable cable with spring shape design, durable and not tangled. | 【Warranty and Notes】: We offer 45 days money back & 1 year worry-free guarantee. NOT WORK FOR SMARTPHONES AND COMPUTERS. ONLY compatible with some specific landline phone models listed in description (include but not limited). For phones not listed, please consult us for Compatibility Guide or Advice.

【Wide Compatibility】: The aux to usb adapter is suitable for most devices with single 3.5mm audio plug or USB A ports. The USB A male plug is compatible with Windows, Linux, Google, Raspberry Pi, Mac, PC, laptop, desktop, PS4, PS5, etc. And the 3.5mm female jack is compatible with most devices with single 3.5mm audio plug, including headphone, headset, earphone, speaker, etc. | 【Super Durability】: The usb to 3.5mm jack audio adapter adopts durable PVC material and flexible cable, protecting the high-purity copper conductors inside, and providing safe insulation and good toughness to enhance the durability for a longer lifespan. | 【Lossless Sound Quality】: Made of oxygen-free copper wire, the usb to aux adapter (97cm/3.2FT long) avoids loss of sound quality during sound transmission, maintaining the original sound quality for your listening experience. | 【Plug and Play】: Simply connect the female jack of this 3.5mm to usb cable to your device with single 3.5mm plug, and the USB A male plug to your PC, laptop, etc. No drivers or external power sources required. And the USB port can be automatically recognized by system in seconds. | 【3.5mm to USB Cord & Warranty】: Ideal to connect a CTIA 3.5mm headset, TRRS mic or speaker to PC via USB interface. Supports both listening and talking. Easily adds a 3.5mm TRRS 4-pole aux port for your devices with a usb port. And we offer 45 days money back & 1 year worry-free guarantee.