The Revolabs HD Dual Wireless Microphone Systems has high definition audio, 50 Hz to 20kHz, which allows the systems to pick up the entire human voice spectrum. This System utilizes the Revolabs Designed for Speech (DFS20) technology in a compact, easy to use form factor. The HD Dual Channel System provides some audio processing EQ and mixing capability, eliminating the need for external DSP audio processing equipment in many cases. Each System ships with a Charger Base (one or two microphone charging docks) and a Base Station The HD Dual Channel System has a single analog input and output (mic or line level). This means that the HD Single Channel system has the flexibility to be used wherever a wired microphone can be used, making this system ideal for video-conferencing, voice lift and PA applications. Choose from any of the HD wireless Microphones to use with the HD Dual Channel system. Audio Bandwidth: 50-20,000 Hz; RF frequency: 1.92 tp 1.93 GHz; Range: approx. 65'; out of range alarm; 2 hour charge time; 128-bit proprietary Encryption per mic channel; Dimensions: 5.19" x 3.25" x 1.0", .325 lbs; *Note: The image on this page includes optional microphones.