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Works great. I got 2, 1 for the shared living room system & 1 for my room. Long battery life (especially if you turn them off when not in use). Works easily from across large rooms. Auto-detected by O/S, so no driver installation or configuration was required. Uses standard AA & AAA batteries; you can use rechargeable ones, if you want. Very happy.
If you are on a soft surface (couch, bed, etc.), you might want a mouse pad.