Mitel headset OVHS072-MTL, is the OvisLink professional monaural Call Center Headset for call centers and service centers. It is designed for all Mitel phones which have RJ9 headset jack. The headset model OVHS072-MTL comes with a RJ9 Quick Disconnect cord that connects the headset directly to Mitel Business phone's headset jack. Headset volume, mute function can be controlled by the pressing buttons on the phone's keypad. To activate or deactivate the headset connected with the phone, simply press the headset button on the telephone keypad. This OvisLink Noise Free Call Center headset services user with solid, crystal clear voice quality. Designed with professional call center user in mind, this is a corded call center headset with adjustable headband, perfect shape for human head, Rota-table microphone boom, user may place the headset speaker on the left or right ear anytime and Tangle-Free coiled Quick Disconnect cord. This OvisLink Call Center Headset is designed for call center agents to wear all-days and feel comfort. Compatible phone models included: Mitel MiVoice phone models: 4422, 4425, 5312, 5320, 5320e, 5324, 5330e, 5360, 5540, 6390, 6392, 8528, 8568 AASTRA phone models: i220, 4222, 4223, 4224, 4225, 480e, 480i, 6710a, 6725i, 6730a, 6735i, 6737i, 6739i, 6753i, 6755i, 6757i, 7147a, 7187a, 9112i, 9133i, 9143i, 9480iIf you prefer headset with two earpieces on both ears, please choose the headset model OVHS084-MTL, ASIN # B00K1SGR5SOvisLink provides 2-Year Warranty and 30 Days Satisfaction Guaranteed. Many phone model need to setup headset mode on the phone in order to use a headset. You may find detail instruction on headset manufacture OvisLink website.