Listen Technologies LP-39-072-01 - Intelligent DSP RF Receiver 4-Pack (72 MHz)Ideal for upgrading or expanding your existing 72 MHz RF system, the LP 39 072 Intelligent DSP RF Receiver 4 Pack includes everything needed to provide your visitors with exceptional assistive listening service. Each pack includes four of our LR 4200 072 digital RF receivers, which feature Listen Technologies unique DSP SQ (TM) noise reduction technology, an OLED display, dual 3. 5 mm output jacks, and more. The Micro USB connection is used with free