Logitech M525. Device interface: RF Wireless, Movement detection technology: Optical, Purpose: Office. Frequency band: 2.4 GHz. Wireless receiver interface: USB, Receiver type: nano. Power source: Batteries, Battery technology: Alkaline, Battery type: AA. Mac operating systems supported: Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion