I have the older MX3000 version

but here is newer MX3200 version:
http://www.logitech.com/index.cfm/pr...ONTENTID=12130

"Extended battery life
Sophisticated power management technologies mean that batteries can last up to 15 months for the keyboard and up to 6 months for the mouse. The convenient LED battery indicators flash when batteries need changing. The mouse features an On/Off switch to extend battery life even further."

I suddenly have an urge to upgrade to this model