Was GREAT until Firefox and Microsoft setting changed without informing me. I'll attempt re-syncing all my Logitech keyboard, tools and mice. I've always enjoyed advanced technologies, until along came a spider (Brown Recluse) and bit me, another got me 9 months ago. 15 months of excruciating symptoms, the past 6 months BLISS! Since becoming critically disabled I cry, because I was ignorant and apathetic of others with disabilities. Logitech products work, and many of us suffer less. Namaste, rjl