AKG Acoustics WMS 40 D/HT Pro Dual Channel UHF Wireless System with 2 Handheld Transmitters, Frequency 60
The AKG wireless handhelds work great.  I operate the sound booth for our church and these microphones are great.  They have lots of power.  The receiver has a volume control as well as being able to adjust levels on the mixer.  Vocals are great.  I can't wait to get a few more and be rid of all the corded microphones.