The UH820S is of trade quality and professional product that offers the finest components, engineering and styling and outstanding performance in all conditions and situations. Just what you would expect from Uniden. With newest feature, the voice enhancer allows you to choose 4 different audio level settings (normal, bass, mid-range and high) the UH820S provides a natural voice enhancer for sharp clarity and performance. The benefit of the Smart Key allows you toggle between Voice Enhancer, Instant Channel or Call Tone Feature to tailor to your needs. The latest innovation added to the Uniden UHF range, Master Scan® technology, is designed to ensure minimal disruptions for continuous communication and offers users to seamlessly communicate on a group of channels. If your current channel is interrupted by outsiders, all radios in your group will automatically jump to a new clear channel allowing uninterrupted communicate to continue.