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PERSONAL SOUND AMPLIFIER, NOT A MEDICAL DEVICE: makes voices, TV and other sounds louder for mild to moderate listening difficulty. Amplifies all sound rather than picking speech out of noise. Not for severe loss or hearing that differs between ears. CHECK THE FIT BEFORE YOU BUY: each amplifier is 20 mm long, 1.9 g, on a soft silicone dome. 8 pairs of domes: 12 mm double-flange fitted, plus 9, 11, 12, 13, 15 mm double and 10, 13 mm single. Not for small or narrow ear canals. Fit guide: image 4. WHISTLING MEANS THE DOME IS NOT SEALING, NOT A FAULT: move up one dome size, seat it a little deeper and turn the volume down a step. Set the volume after the dome is seated, as pressing the unit in can nudge the button. Most whistling stops at once. ONE SMALL BUTTON, NO APP, NO BLUETOOTH: short press for 4 volume levels, double press for 4 modes (Intelligent, Outdoor Noise Reduction, Meeting, General), each confirmed by a beep. 8 channels help reduce background noise. Not for limited dexterity. UP TO 27 HOURS PER CHARGE, 216 HOURS WITH THE CASE: the case adds up to 7 more charges. First charge 10 to 12 hours, then 2 to 3 hours a top-up. One side silent? Reseat in the case and swap the dome. Still silent? Contact us: 12 month warranty.