The Saramonic SoundBird T3 is a directional shotgun microphone that features a cardioid polar pattern built-in rechargeable battery 150 Hz low cut switch +6 dB high-frequency boost -10 dB Pad and power button. This professional shotgun microphone delivers a broadcast-quality sound for ENG filmmaking field recording sound design and broadcast applications. 10dB Pad Attenuates the microphone input to allow for the recording of loud sounds without clipping. 150 Hz High Pass Filter 150 Hz High Pass Filter reduces the low frequency and infrasonic rumble from HVAC systems indoors or street traffic outdoors from over-powering the recording. High-Frequency Boost It restores some of the high-frequency content that is often lost when a blimp or furry windshield is placed over the microphone and improves the intelligibility of recorded speech. Rechargeable Built-in Li-ion Battery The built-in battery supports at least 150 hours of operation. Solid Brass Construction It prevents radio frequency interference for a clean sound. Gold-Plated XLR Connector The connector resists corrosion and ensures excellent signal transfer. Battery Indicator If you would like to check the battery level during recording double press the Power button the 4 indicators will show the remaining battery capacity. If 4 indicators are all blue the battery is full.