link 1.0 Djem Guerreru Inc. https://www.djemguerreru.com 21600 JOITO's https://www.joitos.com https://cdn.joitos.com/GENERAL/17/178/1783/17839206.V0.jpg 400 250 https://www.joitos.com/item/35357334/Headset%2DAmplifier%2Dand%2DInterface%2DModule - Provides headset interface for phone without a headset jack - Adjustable amplification of headset transmit and receive - Powered by 12V power supply (included) or 2 AA batteries (optional) - Headset On/Off button - Mute button - Headset volume control - In-use indicator LED - 3 RJ11 ports for headset, telephone handset, and telephone 59.32 USD 1 Electronics & computer--Office products & supplies--Office equipment & equipment supplies--Telephone--Headsets