Vtech Safe & Sound Digital Audio MonitorProduct details DECT 6. 0 digital technology provides crystal clear transmission, eliminating the annoying white noise you hear from analog monitors. The only sounds you hear are coming from your baby. With up to 1,000 feet of extended range, you can carry the parent unit with you everywhere you go, even out into your yard. For times you need added peace, turn the sound down on the parent unit and rely on the visual sound alert LED's to indicate sound