DSP: Digital Signal Processing* enhances the sound of your voice.
SSP: Secure Simple Pairing* If your phone supports SSP you will not need to enter a PIN code or Passkey.
HSP: Headset Profile* For voice and mono music, this is the most commonly used profile, providing support for the popular Bluetooth headsets to be used with mobile phones.
HFP: Hands Free Profile * is a more advanced version of HSP. Allows Voice Dialing Activation + Redial + Call Transfer + Call Answer/End capabilities.
A2DP: For stereo, but not for voice, Advanced Audio Distribution Profile* is designed to transfer a stereo audio stream like music from another bluetooth devise to a bluetooth headset.
ESCO: Extended Synchronous Connections* improves voice quality of audio links.
AVRCP: Audio/Video Remote Control Profile* is a Bluetooth profile that allows Bluetooth devices to control media playback on remote devices. It is typically used with A2DP devices for next/previous track selection and pause/play functions.
AudioiQ2Technology: Has two omni-directional microphones, DSP, speaker driver, 10 mm, internal adaptive 20 band equalizer, and acoustic echo cancellation.
AudioiQ3Technology: Has three microphones, DSP, internal adaptive 20 band equalizer, acoustic echo cancellation, and sidetone detection for noise and tones.
Wind Protection: WindSmart* aggressively blocks intrusive wind noise.
Multipoint: This technology lets you pair and maintain a connection with two devices.
Audio Streaming: Lets you stream music, podcasts, GPS, and other audio applications from A2DP-enabled phones.
About two weeks ago, I purchased the Plantronics 320 from a local cell phone store. I had been wokring at a location that did not have phone service and needed to free up my hands. I did absolutely no research on Bluetooth headsets, and wound up buying this unit because it was the least expensive. I had to choose from the Plantronics 320 and several Motorola headsets that cost nearly twice as much. This is one of those rare times when I decided not to spend more money to buy the more established brand and I am actually satisfied with the purchase. I have had no problems setting it up and using it. My only gripe is at times the sound quality is not as good as I would like it to be. I do get some occasional static. But that could also come from my cellular provider, Verizon. It’s also all plastic, but for the price, I cannot complain. If you are looking for an inexpensive Bluetooth headset to use with your cell phone, I would recommend the Plantronics 320.