The volume of the device allows to be desired. Is quieter than any speakerphone when mobile. Anyone who believes that to deal with NEM headset will notice that there are other than the headset that is as good as any to buy that will fit into the very special connection.
The headsets that this did not sit well and have no PTT button. According to the manual headset works only in conjunction with the VOX mode.
But for the price they are ok, the headset connector is not usable.