The philips lfh234 headset is one of the most comfortable headsets around and gives very clear sound to use it with the older model philips 550 555 560 or 670 desktop transcription models you will also need to buy the philips lfh0032 adapter to connect the headset to these units extra foam ear pads are also available for this headset features the lightweight under the chin style headphones with dual sound system are designedto deliver excellent sound quality with soft ear cushions for