In Stock. Learn to love wireless again! AKG breaks the feature and price barrier with the WMS400 series of wireless. The WMS400 is a frequency agile system with over 1100 possible channels, an auto set-up/frequency scan function, infrared setting of your transmitter, and a special high tech display that changes from Green to Red to alert you of any problems. You'll never have to worry about drop outs or interference again! The WMS400 features an ultra small body pack that will provide up to 8 hours of operation on a single "AA" battery. It doesn't get any better than this at this price point!