Sennheiser EW Wireless HandHeld Mic System EW135 G3 G (566-608 MHz) True Diversity Rack Mount Wireless Microphone System with Round Base Mic Stand Wireless synchronization of transmitters via infrared interface Auto-Lock function avoids accidental changing of settings Automatic frequency scan feature searches for available frequencies The handheld microphone allows you to charge the optional rechargeable pack while it remains in the transmitter Round Base Microphone Stand Included