Slot-in kit (upper flange + rear panel) for Sony cameras with a DB15 (M) connector. This is a passive mechanical accessory designed to enable slot-in integration on cameras that support two channels via the internal double-pin. Attenuation is 20 dB for the standard version and 0 dB for the SLK42-SX-0 variant. Compatibility is model-specific; verify two-channel support on the chosen Sony model before installation. No power is required.