the wireless mouse is in idle mode a controller checks the wireless mouse in step 210 the wireless mouse returns to an operation mode in step 204 when it is operated in step 210 if it is u201c no u201d in step 210 then step 212 is proceeded and an interrupt is enabled after the interrupt is enabled the wireless mouse enters into the sleeping mode in step 216 when a user utilizes the wireless mouse in step 218 and the interrupt is disabled in step 219 the wireless mouse returns to the operation mode in step 204 if the user does not utilize the wireless mouse in step 218 it stays in the sleeping mode in step 216 the length of t1 and t2 may be configured by the power saving method for example t1 may be 1 second and t2 may be 5 seconds t1 maybe 2 seconds and t2 may be 10 seconds in the present invention the wireless mouse enters into the sleeping mode entirely and consumes lowest power the wireless mouse does not return to the operation mode until the interrupt is disabled therefore the power saving method of the present invention can save more power than that in prior art the present invention provides two.