Avlex: MIPRO ACT-707HM

Features :

World's first ACT-function. Once you press the [ACT] key on the receiver panel, the transmitter channel is automatically locked to the receiver frequency.
Maximum 148dB SPL is achieved by the proprietary "Photo-cell Coupling" high dynamic range modulation circuitry.
Advanced efficient transmitting and low power consumption circuitry design provides long operating hours with only 2 AA batteries .
LCD panel displays group, channel, error code and battery meter status simultaneously.
Integrated antenna, fine-crafted and ergonomically-designed housing.
Extremely low handling-noise feature leads the competitors.
Unique dual steel microphone head-grille design for anti-pop noise suffers no impact damage when dropped.
The supercardioid vocal capsule with high fidelity, wide frequency response, high dynamic range, and transient response contributes the best sound quality in the digital audio age.