The stand out or rather, the most important feature of the 4000 is the inclusion of the Blu track sensor. This technology has given the 4000 the power to operate on any kind of surface where most mice would fail. It integrates the accuracy of laser tracking with the wide angle coverage of any ordinary optical mouse. Unlike the Explorer Mini who did not include the power off switch to save battery and the operability to use both hands (in the sense, right handed as well as left handed users) have been introduced in the 4000. The buttons of the 4000 are programmable to suit the user. They have also included a driver software to program the buttons but if you don’t carry the CD along when your outdoors, you can always you use the normal mouse settings in the computer. Such features make it very helpful when traveling. The transreceiver is well placed  [...]