AKG WMS40 Mini  The WMS40 Mini wireless microphone system provides crystal clear sound and is a true plug n play solution. WMS40 Mini system stands out for its extremely long battery life of 30 hours with a single AA battery High Quality Performance Known for their incredible condenser microphones and audiophile headphones, AKG is all about sonic integrity. The WMS40 mini continues the tradition capturing crystal clear sound for music vocals and speech. Operating in the UHF spectrum, the system offers 100 ft of reliable wireless performance Simple Set Up The WMS40 mini is designed for giving you great sound in an instant. The system features fixed frequency operation (661.1 MHz) so all you need to do is turn on the receiver, switch the transmitter to on, and your ready to rock. The transmitter features a cardiod dynamic microphone capsule for maximum gain before you expereince any feedback.  30 Hours of Operation The transmitter of the AKG WMS40 offers an astounding 30 hours of battery life on just a single AA battery(sold seperately). This saves you money in day to day operation and allows you to have worry free performances even if someone can't seem to put down the microphone. Main Features Portable wireless system with excellent battery life and easy set up 100 ft wireless operating range 30 hours of transmitter battery life on 1 AA Batteries (sold seperately) Includes SR40 mini wireless receiver Fixed frequency design for fast and easy set up Balanced 1/4 output for connecting to speaker or mixer Includes universal power supply Large volume knob on receiver Transmitter features On/Off/Mute slider