The Razer Lachesis™ gaming mouse takes on the same lethal traits as it's namesake (the largest of the Pit Vipers, no we didn't know that either!) that will send shivers down your enemies' spines.
Manufacturer Details: ( Razer )

Equipped with the revolutionary 4000dpi Razer Precision 3G Laser™ sensor, the Razer Lachesis™ gaming mouse takes on the same lethal traits as its namesake (the largest of the Pit Vipers, no we didn't know that either!) that will send shivers down your enemies' spines. Add 32KB of onboard memory, nine programmable Hyperesponse™ buttons, as well as an impressive 1000Hz Ultrapolling™ with 1ms response time, and you've got a formidable weapon in your arsenal of destruction. Victory beckons - move in for the kill.
The Razer Lachesis™ reigns supreme with a true 4000dpi 3G Laser™ sensor, which enables movement speeds of 5 times that of a standard 800dpi optical sensor. View the Razer 3G Laser white paper
With a 32KB onboard memory, you can store up to five unique gaming profiles.
The Razer Lachesis™ allows programming of button functions while Razer's Hyperesponse™ technology reduces latency for optimum gameplay.