The SignaLink Model SL-1+ is an enhanced version of the Tigertronics SL-1 Sound Card - Radio Interface. In addition to providing all the features and capabilities of the original SignaLink, the SL-1+ offers fully adjustable Transmit and Receive Audio levels, a front panel selectable short or variable “Hang Time” delay, and a more sensitive Auto- PTT™ circuit. These new features insure compatibility with virtually all radio Mic jacks, Data and Accessory Ports, and now make it possible to attach the SignaLink to the back of the radio, so that you can keep your microphone plugged-in! Support for Voice modes such as Internet Repeater Linking (EchoLink, etc.) and Voice Contest Keyer operation is now provided, and switching from Digital to Voice can be done with just a press of the “Delay” switch. The SignaLink SL-1+ is designed and manufactured using only the highest quality components. Assembly is done using “state of the art” robotic production equipment. Strict testing of every unit, and our high level of quality control insures you of a premium quality product that will provide many years of dependable service. A great deal of effort has gone into the design and manufacture of the SignaLink SL- 1+, and we are very proud to make it available.