The all-new Magic Trackpad 2 has been enhanced to deliver more comfort and functionality than ever before. It includes a built-in rechargeable lithium-ion battery that charges fast, lasts about a month or more between charges, and eliminates the need for disposable batteries. With the included Lightning to USB cable, you can charge your device and automatically pair it with any Mac.
I had been using the battery operated trackpad for years and I liked it but the frequent loss of power due to battery depletion was a bit annoying. Trackpad 2 is rechargeable and has a greater lifespan. I also like the responsiveness of this gadget and greater variety of touches.