【High-Efficiency 48000Hz Ultrasonic Cleaning】This Ultrasonic Cleaner utilizes mature 48000Hz high-frequency ultrasonic technology to generate millions of micron cleaning bubbles per second. Tiny bubbles can go deep into narrow crevices to remove hidden stubborn dirt. Stable high-frequency vibration delivers thorough cleaning power without scratching or damaging delicate eyeglass surfaces. Note: Place lenses face up when cleaning eyeglasses.