Audiovox WHPRF01; 49 MHz Headset RF Headphones; Built-in microchip for auto shutoff; Adjustable band for individual comfort; Adjustable volume control; Signal To Noise Ratio 60 dB; Min Frequency Response 35 Hz; Max Frequency Response 18000 Hz. The WHPRF01 is a single wireless RF headset. It is a high-tech convenience accessory that eliminates annoying wires that can get in the way of a drivers line of sight and clutter up the back seat. 49 MHz wireless headset to be used with Audiovox VOH702, VOH802, VOH1042, and VOH1332 overhead consoles.