Compact Multipurpose Ultrasonic Cleaner

Exact dimensions: 19 × 7.2 × 7 cm (approx. 7.48 × 2.83 × 2.76 inches); tank volume: ≤300 mL; build material: food-grade polypropylene (PP) for tank, base, and casing; power input: USB 3.7 V DC, 2 W nominal; control: single mechanical press button only — no memory, no modes, no backlight. Certified for safe use with eyeglasses (including AR-coated lenses), stainless steel and silver jewelry, quartz and mechanical watches, and synthetic-bristle makeup brushes. Ultrasonic action occurs at resonant frequency (typical for this class: ~40–45 kHz), inducing rapid pressure changes in water that generate and collapse micro-bubbles — a physical cleaning mechanism independent of heat or aggressive chemicals. This enables removal of sub-surface contaminants — such as dried mascara trapped at brush root zones, tarnish nucleation sites on silver, or adhesive residue behind temple tips — without altering surface properties. Cleaning is fully self-contained: no draining pumps, no drying racks, no secondary rinsing required. After cycle completion, simply lift item out, shake off excess water, and air-dry. Variant B includes optional blue LED for visibility in low-light settings, but offers no functional advantage — all cleaning performance derives solely from ultrasonic transduction efficiency and tank geometry.