The MAS 133 Inline Logic Box with XLR Mic In and Out with Switch by Sennheiser is for integrated microphone solutions. It is used in various environments for audio applications such as recording studios, conference room, board rooms and more. It features 2 XLR-3 connectors, one for in and another for output and one XLR-5 connector for the control switch. The MAS 133 is attached between the mic and mixing console and powers the MAS 1 microphone button (sold separately). Programmable operation modes include On, On/Off, PTT, and PTM. A TTL logic connection enables the user to trigger integration with media or camera control systems for various purposes. Mounting brackets and 4 recessed head screws are included.