AI receptionists take thousands of calls, and every one deserves a black box. Black Box is a Video.js v10 skin for reviewing call recordings, styled as a hi-vis flight recorder. The seek bar is the tape: a two-lane waveform with the AI agent above the line and the caller below, so you can see who spoke before you press play. Hover anywhere to read that line. Flags mark the moments that matter (connected, booked, objection, closed), and the level meters, REC lamp, captions and transcript all run off real player state. It is keyboard-first, readable over bright and dark footage (try the test bench above the player), works from 360px up, and calms down under reduced motion.