THE GLX-D ADVANCED DIGITAL WIRELESS VOCAL SYSTEM FEATURES INTELLIGENT BATTERY RECHARGEABILITY, THE INDUSTRY-STANDARD SM86 CARDIOID CONDENSER MICROPHONE WITH EXTENDED HIGH END RESPONSE FOR SMOOTH LEAD VOCAL REPRODUCTION AND THE GLXD4R METAL RACK MOUNT RECEIVER. FOR USE WITH GLX-D ADVANCED FREQUENCY MANAGERS, PROVIDING ROBUST RF PERFORMANCE, AUTOMATIC FREQUENCY MANAGEMENT AND INCREASED CHANNEL COUNT WITH EXCEPTIONAL DIGITAL AUDIO CLARITY AND SEAMLESS OPERATION.