ANC-Mini Adjustable Noise Control

Accessories are supporting equipment, not detectors. Broadly they fall into: Audio aids — external microphones (including wind-resistant designs) capture cleaner sound for a recorder; noise-control units reduce unwanted input; ghost-box / spirit-box speakers make those devices' output louder or clearer in the field. Illumination — infrared (IR) illuminators, torches and night-vision lights emit near-infrared light that IR-sensitive and full-spectrum cameras can "see" in the dark, while staying invisible to the eye; LED headlamps provide hands-free white light. Power and logistics — USB power banks keep devices running; walkie-talkies coordinate the team; filming rigs mount a phone with light and mic. None of these instruments measures an environmental quantity, so none can "detect" anything on its own. Their relevance to an investigation is reliability and signal quality.

Accessories cannot detect — an external mic captures sound but does not interpret it; an IR light reveals what a camera can see but adds nothing evidential by itself. Some accessories actively create artefacts in other devices. An IR illuminator lights up airborne dust, insects and moisture, which then appear as "orbs" or streaks on the camera it is paired with. A speaker amplifying a spirit box amplifies its radio noise too. Radios add EMF/RF. Walkie-talkies and any powered accessory emit fields that can move a nearby EMF meter or contaminate an audio recording. Quality varies — cheap mics add hiss, cheap lights flicker, power banks can introduce electrical noise.

These false readings are caused in the paired devices an accessory supports: IR-light "orbs" — dust, pollen, insects and moisture lit by an IR illuminator close to a camera lens. EMF/RF contamination from walkie-talkies, power banks and other powered accessories near a meter or recorder. Added audio noise — hiss, handling noise or speaker feedback introduced by a mic, rig or speaker. Lens flare and reflections from torches and headlamps. Best practice: keep IR illuminators off-axis and away from the lens to limit orbs, keep radios and power banks clear of meters and mics, and remember that an accessory's job is to make the primary instrument more reliable — it never supplies evidence on its own.