SLX Wireless Receiver with Optional Logic ModuleShure SLX Series Wireless ReceiverThis wireless receiver features 2 time saving functions: Automatic Frequency Selection & Automatic Transmitter Setup. These features make the SLX series extremely easy to use and when coupled SLX4L logic output function you can use software echo cancellation and even remotely monitor the microphones battery life. SLX Wireless Systems feature the Shure patented Audio Reference Companding for clear sound beyond the