In Stock. Twin Packs save you money! Buy the AKG WMS40/Diversity/ HT 40 hand held wireless twin pack, and save 50 bucks (over buying two units separately)! The pack contains two completely separate units that are different frequencies, so you can be assured that the units will work together. The twin packs have the same outstanding features that have made the regular WMS40/Diversity system so popular, only you save money by buying them two at a time!