I buy this keyboard\/mouse combo because I need a way to play my computer game that be display via hdmus to my big screen tv . this combo have a huge reach and I have never have a issue with the signal be drop or laggy . I buy these somewhere around 5 month ago and the original battery be still display as full with pretty heavy daily use . never see a mouse like this one , do not have the typical red laser eye for tracking , have no light at all actually , but it literately work on anything include my jeans . Logitech do it again , I be weary of spend this kind of cash on a keyboard and mouse , but I be very happy I do .