<ul><li>For_Use_With - VoIP and PBX Phone Systems</li><li>Accessory_Type - Audio Processor</li><li>Pre-consumer_Recycled_Content_Percent - 0%</li><li>Post-consumer_Recycled_Content_Percent - 0%</li></ul><br><br>This item requires the handset to be lifted on most phones for use. A HL-10 will need to be added in order to use this unit without lifting the handset. This item has specific phone setting. They can be found on the Plantronics website.

Plantronics Vista M22 Amplifier 43596-64 (Renewed)