3 of 4 people found the following review helpful
on October 11, 2012
I ordered 14 of these units for a class. Right away, the microphones began to fail. After several returns, I contacted Califone direcly and they agreed to replace all with an upgraded unit (HPE-1010). Those started to fail as well. I returned 6 of those and some of them failed. I'm getting my money back and ordering Plantronics -- stay away from Califone!