5V USB Dimmer Switch 10-Step

Form factor: slim, lightweight plastic housing in matte black; designed as an inline USB-A extension cord with integrated dimming circuitry. Dimensions follow standard USB cable conventions; physical tolerances align with industry norms (±1–3 cm). Input/output: 5V DC only, female-to-male USB-A topology. Intended exclusively for constant-voltage 5V single-colour LED lighting — not suitable for RGB, addressable (WS2812), or higher-voltage systems. Package includes two functional dimmer units — no additional components, documentation, or packaging beyond what is necessary for retail compliance. Operational logic: short button press toggles through ten evenly spaced brightness levels (10%–100%); long press enables analogue-style brightness ramping across the same range. Memory retention is triggered only when the upstream 5V supply remains uninterrupted — e.g., when plugged into a desktop PC’s always-on USB port — and resets only upon full power removal (e.g., unplugging the charger or shutting down the host). Applications include ergonomic lighting adjustments (TV backlight, monitor halo), decorative accent lighting (neon name signs, bookshelf LEDs), functional illumination (3D printer chamber, laptop stand lighting), and energy-conscious setups (RVs, dorm rooms, portable workstations) where precise, low-power light management is essential.