iStat menus monitors your entire system right from your menubar, with 8 separate and highly configurable menu extras. You'll always know exactly what's going on inside your Mac! CPU usage. 7 display modes, multiple core support. Memory usage. 4 display modes, page ins/outs and swap usage display. Disks usage and activity. 6 display modes and the ability to hide disks you don't want to see. Monitor networking. Current and total bandwidth, peak bandwidth and IP addresses. Temperatures. Monitor the temperature of your Mac with 2 display modes and the ability to hide sensors you don't want to see. Fans. Monitor the fan speeds in your Mac. 2 display modes and the ability to hide sensors you don't want to see. Bluetooth. Control bluetooth status plus monitor the battery level of your Apple wireless keyboard or mouse. Date & Time. Date, time a calendar and a world clock in your menubar.