Office Occupancy USB Traffic Light Signal

12.5 cm tall, 8.5 cm wide, 4.5 cm deep; mass: 220 g; powered exclusively by USB 5V (supplied cable: 1.2 m, USB-A to USB-A, tangle-resistant braided sheath); body material: matte-finish ABS with reinforced corner ribs for drop resistance (tested to 1 m onto carpeted floor). Status indication uses industry-aligned colour semantics: red = active focus / no interruption, yellow = open to brief queries, green = fully available — mapped directly to ISO/IEC 2382-37 human-computer interaction standards for status signalling. Activation is tactile and direct: one press advances state; no hold-time, no double-tap, no mode menus. Mounting: precision-machined silicone clamp (adjustable jaw width 10–40 mm) + 3M VHB™-grade removable adhesive — both included and pre-applied where applicable. Ambient lighting function operates independently of status mode: when set to green, the unit emits a soft white ambient wash (4000K CCT, 15 lm output); red and yellow retain colour fidelity while lowering overall lumen output — balancing signal priority with atmospheric intent. Designed for durability in shared environments: IP20-rated enclosure, RoHS-compliant components, and CE/UKCA marked for electromagnetic compatibility in dense office clusters. Field-proven in UK university innovation hubs, Berlin co-working spaces, and Amsterdam remote-first studios — adopted where cross-cultural teams rely on visual, language-agnostic cues to coordinate across time zones and communication styles, and where workspace flexibility demands hardware that moves as easily as people do.