Williams AVFM 557 Large-Area Dual FM Plus and Wi-Fi Assistive Listening System with FM T55 Transmitter, (4) PPA R37N Receivers, (4) EAR 022 Earphones, (2) NKL001 Neckloops and IDP 008 ADA Wall Plaque
| Number of Channels | 17 |
| Audio Output Type | Headphones |
| Format | WMA |
| Wireless Technology | Wi-Fi, RF |
| Connector Type | 3.5mm Jack |
| Audio Output Mode | Surround, Mono, Stereo |
| Connectivity Technology | Wi-Fi, Ethernet |
| Controller Type | Hand Control |
| Additional Features | The system is expandable |
| Compatible Devices | Smartphone, Speaker |
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