Plantronics 620 specification

Is there a visual indicator on the Calisto 620 that shows volume level?

No. There is no visual indication of volume level or volume adjustments on the Calisto 620.

NOTE The Calisto 620 has a mid-range default volume setting. It provides audible indications as you adjust the volume and when you have reached the maximum or minimum volume level.

When I'm out of Calisto 620's Bluetooth range while on an active mobile phone call and then come back into Calisto 620 Bluetooth range, Calisto 620 does not auto- reconnect to the mobile phone/call (as it does with Voyager Pro UC).

This is by design.

When Bluetooth mobile headsets reconnect to a mobile phone when in-range, call privacy is not compromised because other people cannot hear the tiny speaker in the headset, but auto connecting on a speakerphone can compromise a private conversation if audio is played over its loud speaker unexpectedly.

For this reason, it is necessary to reconnect manually to Calisto 620 from the mobile phone UI, or, to do a 2 second key press on Calisto 620's Call Button to move the audio back to Calisto 620. This is for user conversation confidentiality.

At times I hear some clicking/ popping sounds while on a call with Calisto 620, is this distortion or some sort of a product defect?

•Bluetooth devices, like Calisto 620, can be susceptible to interference from Wi-Fi and/or other Bluetooth devices.

•If you use Calisto 620 near a Wi-Fi access point or in a Bluetooth-intensive environment, some interference can be experienced in the form of audible artifacts through Calisto 620's speaker.

•If these artifacts are not present when using Calisto 620 away from Wi-Fi and/or Bluetooth- intensive environments, then it is very likely the artifacts are caused by radio/RF interference.

Music/media played on Calisto 620 does not sound as good when streamed from the PC as it does when streamed for my mobile or smartphone. Why?

The Calisto 620 Bluetooth adapter supports wideband audio for both speech and media/music, so the fidelity is not as high as music/media streamed via A2DP from a mobile/smartphone side, which is Hi-Fi.

What size room and how many participants does Calisto 620 support for group conference calls?

There are 2 variables to consider for this answer, and both involve the perceived audio quality experiencedby listeners on the other (far) end of a Calisto 620 call:

The acoustic properties of the room: Not all rooms are created equal, and room acoustics can vary significantly.

The subjective opinion (or hearing abilities) of the far-end listener(s) which can also vary significantly

With these variables considered, in general Calisto 620 can be used in up to a 12x12 foot room with up to 6 participants.

Can the USB power cable be used for audio-over-USB during calls? Can Calisto 620 also function as a corded USB device?

No. The USB cable is for power and Direct Firmware Updates (DFU) only.

NOTE An accessory cable is available from Plantronics which emulates the corded experience; through a single USB port on the PC, this cable provides 1) a connection for the Minimax USB Bluetooth adapter and 2) a power connection to the speakerphone. (PN: 86215-02)