If wearing a conventional personal sound amplifier feels like an embarrassment to you; try the Stealth Secret Sound Amplifier. It looks just like a cell phone ear adapter and works as a sound enhancer so you can hear the sounds of nature from 50 feet away. Now you can enjoy the best of both worlds: a more youthful appearance and amplified sound from the world around you. Comes with charger (no batteries to replace) and three ear tips.Safety Information. Always charge your amplifier for a minimum 4 hours prior to first use for best battery power over the life of your unit.