查了一下MX Optical Engine 800 dpi optical performance with 5.8 Megapixels/second image processing and 12-bit USB makes the G1 a lightning-fast performer with precision tracking at any speed. 80 gram ultra-light construction At a mere 80g, the G1 moves effortlessly, even through your longest gaming sessions. Rugged design Built for the rigors of hardcore gaming, the G1 can glide up to 250 km and can withstand up to 3 million button clicks. Durable Teflon® super-slick gaming feet Super-smooth glide for precision tracking and targeting. (more...)