1400 Protector Case | Black, Without Foam 9019384-4 The M-7 electret microphone requires

The M-7 electret microphone requires a DC bias voltage supply to operate in place of carbon and amplified dynamic microphones

BLACK ANODIZED KNURLED SHIELD

A toggle switch on the battery snap selects whether the microphone LEDs or the Maxillo face shield (MFS)* LEDs are activated when using the microphone switch

and screw lock

or water bottle

1400 Protector Case | Black, Without Foam 9019384-4 The M-7 electret microphone requiresThe 1400 Protector case is designed with rugged construction and built to protect even the most sensitive equipment while traveling to the harshest environments. Also, an automatic pressure equalization value is allows for easier opening at any altitude.