Logitech S520 Cordless/ Wireless Desktop Keyboard and Mouse - Open Box. And with extended battery life up to 8 months for the mouse and up to 15 months for the keyboard, it minimizes the hassle of changing batteries.
I needed to replace the same (aged) model; certain keys became intermittent. Though not a 'current' retail model, you should find this model at a considerable discount. This kybd is full featured, has single-button zoom in/out/100% keys I use a lot. This is a complete 'desktop' set of kybd/mouse/receiver. Mouse is also full featured, wheel scrolls horiz as well as vertical. Caveat: many of this model for sale are 'Spanish', look closely at the zoom photo of the keycaps.