(Thanks to BK)

When you receive the pair of PolySync 40 Speakerphones, download the associated management utility to update the Firmware.

1. Follow instructions to pair the two speakerphones
2. Then after they're paired, plug one into the USB port
3. Test the mic and speaker functions via Zoom preferences

• Position one of the units near the main presenter. This is the USB connected device.
• Put the other in the middle of the audience seating area. This can easily be picked up and moved around to be closer to any audience speaker.

• When moving a unit, hold it by the edges. This way you will avoid pushing any of the buttons which might mute the mic or change the speaker volume.
• The one that isn't tethered (connected to USB) will be running on batteries. Be sure to recharge it after use.
• We suspect a unit will operate for about 4 hours on a full charge.
• When charging, the white LED strip will glow off and on; it'll stay off when fully charged.

Needed to update and customize.

The “official” app download page doesn't work. Here is the link to the working download page

Pertinent info from the Polysync 40 user manual download it

When in standby mode, no LEDs illuminate
Need 5 hours for full charge

Make sure both speakerphones are updated to latest release in Poly Lens Desktop App.

1. Pair or connect one speakerphone to your PC or mobile device.
2. Press both Link buttons for 2 seconds. Hear “connecting” and LEDs pulse white.
3. Hear “connection successful” and LED flashes white on both speakerphones means linking is successful.
4. Control system from either speakerphone
5. End linking by pressing both Link buttons for 2 seconds, hear “device disconnected”