I'm using the Medion 8383 one as well, MB, but as I am fed up with it eating batteries I have just bought myself the Logitech MX1000 which comes with charger.
I bought rechargeable batteries, as I'm fed up with constantly running out of AA batteries, which are used in so many things around the house.
Don't you just love Logitech peripherals, Michael also has a Logitech G15 Gaming Keyboard, which is backlit and looks beautiful. And we both have Logitech speakers.