The PHM903 is a professional recording microphone featuring a back electret condenser element with cardioid polar pattern. It delivers a frequency response of 50~18,000 Hz and sensitivity of -68dB ± 3 dB (0dB=1ubar@1KHz). With 250Ω ±30% impedance at 1KHz, it operates via phantom power or battery supply. The microphone incorporates a sliding on/off switch and XLR male connector for reliable connectivity. Measuring 22×181.5mm, it's engineered for studio recording applications requiring precise audio capture. The cardioid pattern effectively rejects off-axis noise while maintaining excellent vocal clarity and detail reproduction essential for professional recording environments.