The M720 Triathlon comes with Logitech’s Advanced Optical Tracking sensor, boasting a resolution of up to 1000 dpi. It can also be connected via Bluetooth, which isn’t surprising given its ...

These are in good working condition, and will come with extra comply medium eartips, if I can dig them up, but will otherwise come sans eartips (they're ~$20 for a three-pack). Great battery life, ...