Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Long talk time

I can talk for over 5 continuous hours on this headset (never tried longer). However, my Motorola HS820 is more comfortable AND my callers understand me better. I get many complaints with the Scala 700 that my voice isn't clear or our connection is bad. In addition, when I listen to mp3 files, the HS820 has a warmer sound. The Scala 700 has a 'tinty' sound.The Scala 700 comes with a proprietary usb and a case. Nice.