• no echo problem
• good quality in general
• difficult to use a long time

• Compatible with most popular sound cards
• Superior speech recognition microphone
• Inline volume and mute controls
• The frequency response of the microphone is reduced to human voice
• No background noise is transmitted, only voice is sent.

• no echo problem
• excellent quality (the best)!
• comfortable
• Digital Sound Processor included
• All the USB Headset work perfectly on Windows, Mac OS X and Linux

This is a "all in a box" echo canceler system. It contains the microphone and the speakers. You just have to connect into a USB plug of your computer/laptop.
Works for a desktop system but is sensitive enough to work as a small-room microphone.

• Works on any operationg system (no drivers needed)
• Perfect quality audio
• Mute button.
• Can be connected via analog or USB connector
• Relativly inexpensive for echo canceler system (~$300)

This echo canceler microphone works with any external speakers. The microphone plugs in a mic input and in between the speakers and computer to filters out any sound from the speakers to the mic and so stops any echo.
Works for a desktop system but is sensitive enough to work as a small-room microphone.

• Works on any operationg system (no drivers needed)
• Take power from the USB connection.
• Good quality audio, Mute button.
• Inexpensive for echo cancelling system (~$200)

This echo cancelling microphone works with any external speakers. The microphone plugs in a mic input and in between the speakers and computer to filters out any sound from the speakers to the mic and so stops any echo.
Works for a desktop system but is sensitive enough to work as a small-room microphone.

• Allow to use our own audio speakers.
• Works on any operationg system (no drivers needed)
• Correct quality audio
• No mute button. :(
• Relativly inexpensive for echo cancelling system (~$300)

This is a "all in a box" echo cancelling system. It contains the microphone and the speakers. You just have to connect into a USB plug of your computer/laptop.
Works for a desktop system. Don't expect to use with more than 3 persons close to the microphone.

• Does not work properly with RAT on Mac OS X. :(
• Telephone quality audio
• No Mute button. :(
• Take the power from the USB connection.
• Really Cheap (~$40)

This PCI card is an echo canceler system that must be installed in your PC. It is coming with a "iBall" microphone.
Works for a desktop system and any room size. For room you must already have the microphone(s), the local audio speakers and a full-duplex sound card.

• Echo Cancellation, Noise Suppression, Voice Leve Compression
• Simple to install.
• Good quality audio
• Inexpensive for echo cancelling system (~$100)

• Full-duplex technology rivals talking on a handset
• Microphones for 360 degres pick-up, echo cancellation and automatic gain control DSP technology produces
• Intelligent mic mixing for precision voice pick-up
• Neodymium speaker produces hi-fidelity sound with dynamic, balanced range
• 16 digit LCD displays caller ID, time of day and duration of call
• The interconnect box accessory (Product Number 2200-01906-001) will allow you to use your SoundStation line of products with many desktop videoconferencing products.

Tips:  - Don't add the extra microphones (decrease the quality of the voice).
          - For a bigger room connect two SoundStations and Interconnect Boxes in parallel.