Introducing the Cellet Mono 2.5mm Hands-Free Headset with Boom MicrophonePerfect for call centers, telemarketing, business office phones, home and cordless phones….Compatibility Includes:Cisco SPA/Grand stream/Panasonic/AT & T/Polycom/Siemens…. and many, many other phones with a standard 2.5mm Headset jack.Can be worn in right or left ear. Adjustable headband with flexible boom microphone.Hassle Free Warranty- guarantees your satisfaction with a 3 year worry free manufacturer’s limited warranty.CelletWelcome to Cellet, the largest wholesaler and manufacturer of mobile accessory brand for over 20 years.Cellet is proud to announce that all of our products are designed in USA.High Quality Sound and Premium ProductsCellet’s products are inspected and tested before shipment. We have over 3,000 products to choose from.Certified from Wireless ManufacturerMost of our products is certified from Apple or third party inspection companies.Superior Customer SupportCellet is committed to providing reliable and unsurpassed customer support.