TOA wireless microphone tuners are designed to deliver outstanding performance levels, stability and overall reliability. A wide choice of channels realized by the use of the PLL-synthesized oscillator enables you to select channels freely to prevent any interference. In addition, TOA tuners provide significantly less potential for noise caused by changeovers between antennas, by employing true diversity and space diversity methods. A two-line LCD display enables faster meter reading. Remaining battery power indication is also provided. A PLL synthesis system is incorporated to generate highly accurate frequency output signals that help achieve better overall system performance. For further performance enhancement, a TOA diversity system eliminates dead spots and provides more stable signal reception. Noise reduction is improved with a squelch function (carrier, noise, tone), and a compander function minimizes ambient noise pickup. For easier operation, a Channel Check function simplifies channel setting operations on wireless microphones used on multiple channels simultaneously. A low battery indicator monitors and indicates microphone battery voltage status.