2-Year Warranty: 45 days money-back & 24 months warranty. Plug and play, ideal for Call Center, Conference Calls, Telemarketing, Business, Office and Home. ONLY works for phones with standard 2.5MM headset jack, NOT for Smartphones and Computers. For other phones, pls contact us for compatibility advice. Ultra Durable: Precision design, quality plastics, uni-body headband construction, high quality microphone makes this office phone headset with microphone sturdier and more durable. 5ft long telephone headphone's cord offers flexibility to move around. All Day Comfort: Super comfortable call center headset with ultra lightweight fit and adjustable headband to fit all head sizes, high quality and soft leatherette ear cushion enhance all-day wearing comfort. Professional Mic Mute / Volume Control built in. Crystal Clear Calls: Wideband sound 2.5mm telephone headset enables a clear listening experience, built in high quality noise cancelling microphone to reduce background noise, acoustic shock protection circuit to protect your hearing. Wide Compatibility: ?NOT for Cell phones and Computers? This landline phone headset is ONLY compatible with Polycom AT&T Panasonic VTech RCA Uniden Grandstream Polycom Clarity Yealink Zultys Gigaset Cortelco landline phones and most Cordless Dect phones with standard 2.5MM headset jack. SEE MORE COMPATIBLE PHONE LIST IN DESCRIPTION.