I own 3 other Plantronics headsets and each of them is great. This model is an inferior product that should not bear the Plantronics name. You would expect a wired headset to be clear and loud. This on is neither. Ironically my other Plantronics units are all wireless and work wonderfully. Look beyond this unfortunate model.
No problem with unit except that battery was nearly dead - bought directly from Amazon. Right out of the package the Honeywell door chime unit said that battery was weak and needed to be replaced. Disappointed since the battery costs one-third of what the whole unit costs.