For remote desk phone call control (answer/end); eliminates the need for a HL10 Handset Lifter. Sends a ringer alert to the headset any time the phone rings. Designed for use with phones that also support native headset hookswitch control, and works with Plantronics CS50, CS60, CS70, and Voyager 510S wireless headset families. Also works with ShoreTel and Toshiba desk phones, and may work with additional manufacturers. Sold by each. Black.