This handheld transmitter microphone from the U300 series operates in the 655 - 679 MHz frequency band and features a dynamic cardioid capsule with 10 mW output power and a frequency response of 55 Hz - 16 kHz. It has a runtime of over 10 hours with two AA batteries, is conveniently synchronized via infrared with the U306 receiver, and a pilot tone ensures trouble-free operation. For flexible vocal and speech tuning, the U306 HH is compatible with the interchangeable microphone capsules of the U500 series.