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The silver UI 710 Passive Headset/Handset Switch from Sennheiser works as a connector between your handset and headset. At the touch of a button, a passive box enables you to switch back and forth easily between handsets and headsets, or even integrate a PC into the system.
Enables you to switch between handset and headset at the touch of a button
Easy to set up and use
Line powered, therefore no battery or AC transformer required