Running very stable and reliable,with ads. Very suitable for police,lawyers,journalists,voice acquisition personnel, meeting recording,training record,classroom recordings, music teaching, music production,recording and personal needs. Voice Changer feature is ideal for funny and entertaining. “ZTX LE Time Stretch/Pitch Shift technology licensed from Zynaptiq GmbH, http://www.zynaptiq.com/ztx (c) Zynaptiq GmbH”.