It is very useful for teaching, meeting assorted PC & slide. It is wireless remote control to show the files through computer. Model ： RF1305USB plug-and-play. No driver required. System: WINDOWS98/2000/ME/XP Linux & Mac OS Control distance: up to 25mWorking voltage: 3V Battery: 2*AAAWavelength: 650nm Max output < 1mW or < 5Mw Radio Frequency technology/433. 92Hz /315HzSize : 121 x 25 x 13 mmMain Function 1.Laserpointer function; 2. Page up function3. Down function4.built-in flash memory optional(128M,256M,512M,1G)optional;5.black screen and turn off computer optionalgift box50pcs/ctnGW:8kgsNW:9-10kgsMEAS:41*33*22cm