Controller(UC button) for UH34 SE, USB-C The Yealink YHC20 Controller YHC20UC-SEis a USB-C to 3.5mm minijack adapter cable with a volume controller and UC button. This controller is designed specifically for the Yealink UH34 SE UC Edition Headset. It is a brand new item, in its original packaging, and comes with a 12-month manufacturer's warranty. The controller features an answer/end button, mute button, Teams/Voice Assistant button, and volume up/down buttons. Purchase the Yealink YHC20 USB-C Controller YHC20UC-SE for UH34 SE UC Edition at a competitive price from The Telecom Shop and explore our wide range of telephone systems and devices.