abcGOODefg Handsfree Call Center Headset Single-Ear Corded Noise Cancelling Headphone (2.5mm Monaural Headset) 1.Keep your hands free and increase productivity by working with computer,taking notes or handling other tasks. 2.The external volume control gives you superior quality sound and hearing satisfaction. 3.High definition digital voice communication: noise cancellation technology microphone improves voice clarity. 4.The headset clip can be stretched freely and comfortable wear,adjustable length:45mm. 5.Single-ear 2.5mm headset: ideal for having an open ear to your surrounding when making a desktop call.