Razer Revamps DeathAdder Mouse, Adds a 4G Sensor, Better Grips
"We didn’t want to fix anything that wasn’t broken," said Robert Krakoff, president of Razer USA. "We focused instead on enhancing and optimizing the proven merits of the Razer DeathAdder, utilizing next generation technologies and further ergonomics tweaks to make a perfect gaming mouse even better."
So, what's changed? The new and improved DeathAdder now sports a 4G infrared sensor with better performance and precision. That's up from 3.5G in the original, which effectively bumps up the resolution to 6400 dpi.

The revamped DeathAdder is still a right-handed rodent (there's also a left-handed version of the original), though it's been further enhanced with built-in textured rubber side grips for better mouse control and grip, Razer says. It also retains Synapse 2.0 support for easy syncing of settings and profiles to the cloud.
You can purchase the new DeathAdder mouse now for $70.