The ATW-R2100 is a rugged metal half-rack receiver, with soft-touch controls, and LCD RF/AF metering. Audio-Technicaâs innovative 2000 Series UHF wireless delivers professional performance unheard of in its class. With this breakthrough series, Audio-Technica makes easy setup, automatic frequency scanning, and other advanced wireless features affordable as never before. Automatic frequency scanning, standard on all 2000 Series wireless receivers, finds and sets the best available channel at the touch of a button. For those using multiple wireless systems simultaneously, the 2000 Series offers another ease-of-use standout: any of its 10 channels may be used together, eliminating confusing frequency groups and other frequency-coordination problems.