OvisLink Call Center Headset Compatible with NEC Business Phones &#9989; Premium voice quality NEC telephone headset. Compatible with all NEC phone models, NEC SL1100 Digital Phone, SL1100 IP Phone (IP4WW); NEC Aspire Phones -- 22-Button / 34-Button; NEC DSX Business Phone -- DSX 22B / DSX 34B and Desktop Terminal UT880, DT830, DT830DG, DT830CG, DT750, DT730, DT770G NEC DTERM Series -- DTR-8D / DTR-16D / DTR-32D &#9989; OvisLink Corded Noise Cancelling Microphone Headset with RJ9 Headset Adapter (Quick Disconnect Cord) for all NEC telephones. Premium voice quality Call Center Headset for professional usage. Advanced featrues include Acoustic Shock Protection, Noise Canceling and RF-Shield. &#9989; Complete set of professional call center headset. RJ9 Headset Quick Disconnect cord included. No need additional purchase. Simple to use, comes with a RJ9 headset Quick Disconnect Cord connect to NEC telephones Headset Jack than press headset button on the phones keypad to use the headset. All phone functions control by the phone keypad can also be used for the headset. &#9989; Comfortable for Center agents to wear All-Days. Over-the-Head Style, Adjustable headband, Lightweight, Smooth leatherette ear cushion, Tangle-Free headset cord and Rotatable Microphone let user place the earpiece on the left or right ear anytime. &#9989; Durable Professional Call Center Headset with 2 YEAR WARRANTY AND 30 DAY GUARANTEE  We stand behind the quality of every one of our products which is why were happy to offer you a 2 year warranty and 30 day guarantee on your Ovislink NEC headset.