"A functional dual-mode mouse for under $20, with accordingly cheap construction."
The 'Dual Device Connection' lets you pair this with one computer via Bluetooth and a second via its USB dongle, using a physical switch on the mouse to toggle between them, which is a genuine convenience feature.
This is a logical choice for a travel bag, a secondary computer, or for anyone who values dual-device switching on an extremely tight budget. The silent clicks are a real benefit in a shared office or library.
Mac users who rely on side buttons should look elsewhere, as they are not supported. Anyone needing reliable precision for creative work or gaming must invest in a mouse with a proven sensor. Users with large hands will find this compact design causes fatigue.