Plantronics SHS1890 Amplifiers Plantronics SHS1890 911 Dispatch Amplifier If you work in a dispatch center then this post will be familiar to you. What most people don’t know is that the SHS1890 Amplifiers will work with ANY Plantronics “H” series headsets. There is an option of cord lengths that you may choose; 10 feet, 15 feet, or 25 … Continued