Razer - Viper Ultimate Wireless Optical Gaming Mouse - Black heart rate tracker Atennna: build in 2

Atennna: build in 2

9V Backup Power - Use a 9V battery as backup power in case the batteries run out

Get on-screen workouts that play on your wrist and coach you through each move

Optional 24/7 Emergency Response Service

featuring a smaller screen size and omitting the DVD/CD drive to achieve the compact form factor

Razer - Viper Ultimate Wireless Optical Gaming Mouse - Black heart rate tracker Atennna: build in 2Razer Viper Ultimate Wireless Optical Gaming Mouse Black Get a better handle on your games with this Razer Viper Ultimate wireless gaming mouse. The 20,000 dpi optical sensor delivers pinpoint accuracy for obliterating your opponents on the battlefield, while the ambidextrous design allows comfortable use. This Razer Viper Ultimate wireless gaming mouse has eight programmable buttons for customization, and the lightweight profile allows easy tracking.