{"product_id":"scienlodic-usb-rechargeable-sound-amplifier-adjustable-tone","title":"Scienlodic USB Rechargeable Sound Amplifier – Adjustable Tone","description":"\n\u003ch2\u003eScienlodic USB Rechargeable Personal Sound Amplifier\u003c\/h2\u003e\n\u003cp\u003eEnhance everyday conversations and enjoy clearer, fuller sound with the Scienlodic USB Rechargeable Personal Sound Amplifier. Designed with seniors and first-time users in mind, this compact, discreet device features adjustable tone modes and volume control so you can customize your listening experience with ease. No batteries to swap — simply recharge via USB and enjoy up to 40 hours of continuous use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eMade in China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ Important Note:\u003c\/strong\u003e This listing includes the USB charging cable only. A 1–2A charging head (not included) is required for charging. We recommend using a standard 1–2A USB charging adapter.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Rechargeable\u003c\/strong\u003e – No disposable batteries needed. Charges fully in 4–6 hours (8 hours for the first charge), providing up to 40 hours of use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable Tone Modes\u003c\/strong\u003e – Choose between Low Frequency Compression mode (\"H\"), Normal mode (\"N\"), and 4 volume levels for a tailored listening experience.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSleek, Discreet Design\u003c\/strong\u003e – A cosmetically appealing profile with an internal speaker for smooth, natural-sounding audio amplification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDigital Sound Processing\u003c\/strong\u003e – Channel-based processing gives you direct control over volume output.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple Earplug Sizes\u003c\/strong\u003e – Comes with 3 different-sized silicone earplugs for a secure, comfortable fit that helps minimize audio feedback.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMax OSPL: ≤129dB ±3dB\u003c\/li\u003e\n  \u003cli\u003eMax Sound Output: 117dB ±4dB\u003c\/li\u003e\n  \u003cli\u003eMax Sound Gain: 38dB ±5dB\u003c\/li\u003e\n  \u003cli\u003eFrequency Range: 450Hz – 3000Hz\u003c\/li\u003e\n  \u003cli\u003eTotal Harmonic Distortion: ≤10%\u003c\/li\u003e\n  \u003cli\u003eInput Noise: ≤28dB\u003c\/li\u003e\n  \u003cli\u003eCharging Time: 4–6 hours (8 hours for first use)\u003c\/li\u003e\n  \u003cli\u003eBattery Life: Up to 40 hours (varies by volume level)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMode Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOFF\u003c\/strong\u003e — Powers the device off\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eH\u003c\/strong\u003e — Low frequency compression mode\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eN\u003c\/strong\u003e — Normal usage mode\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1–4\u003c\/strong\u003e — Volume levels (1 = lowest, 4 = highest)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Scienlodic Sound Amplifier\u003c\/li\u003e\n  \u003cli\u003e3 × Silicone Earplugs (Small, Medium, Large)\u003c\/li\u003e\n  \u003cli\u003e1 × USB Charging Cable (1–2A charging head not included)\u003c\/li\u003e\n  \u003cli\u003e1 × User Manual\u003c\/li\u003e\n  \u003cli\u003e1 × Gift Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTips for Best Performance\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eAlways start at the lowest volume setting before inserting the device.\u003c\/li\u003e\n  \u003cli\u003eSelect a slightly larger earplug for a snug seal to minimize audio feedback whistling.\u003c\/li\u003e\n  \u003cli\u003eGradually increase the volume — avoid sudden jumps in amplification level.\u003c\/li\u003e\n  \u003cli\u003eAfter inserting, gently press and hold the device in your ear canal for 1–2 seconds to allow the earplug to fully expand and seal.\u003c\/li\u003e\n  \u003cli\u003eKeep the silicone earplugs clean for best sound clarity and hygiene.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eCharging Notice\u003c\/h3\u003e\n\u003cp\u003eAlways use a compatible 1–2A USB charging adapter. Using an incompatible charger may damage the device. This product does not include a charging head — only the USB cable is provided.\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3d-sleep-mask-soft-breathable-light-blocking-eye-mask\"\u003e3D Sleep Mask – Soft Breathable Light-Blocking Eye Mask\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/4d-cloud-sports-insoles-breathable-pu-cushion-men-women\"\u003e4D Cloud Sports Insoles – Breathable PU Cushion for Men \u0026amp; Women\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does the Scienlodic sound amplifier come with a charging head?\u003c\/h4\u003e\n\u003cp\u003eA: No — this listing includes only the USB charging cable. You will need a standard 1–2A USB charging adapter (not included) to charge the device. Most standard phone chargers with a 1–2A output are compatible.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I reduce feedback whistling when using the sound amplifier?\u003c\/h4\u003e\n\u003cp\u003eA: Start with the volume at the lowest setting before inserting the device. Choose a slightly larger earplug size for a better seal in your ear canal, and gently press the device inward for 1–2 seconds after insertion to allow the earplug to fully expand. A proper seal significantly reduces the chance of feedback noise.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How long does the battery last on a single charge?\u003c\/h4\u003e\n\u003cp\u003eA: The device provides up to 40 hours of use on a full charge, depending on the volume and amplification level selected. Charging takes 4–6 hours (allow 8 hours for the very first charge).\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I switch between tone modes during use?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The device features two main listening modes — Low Frequency Compression (\"H\") and Normal (\"N\") — plus four volume levels (1–4). You can switch between modes and adjust volume at any time to suit your listening environment.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does the Scienlodic sound amplifier come with a charging head?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this listing includes only the USB charging cable. You will need a standard 1–2A USB charging adapter (not included) to charge the device. Most standard phone chargers with a 1–2A output are compatible.\"}}, {\"@type\": \"Question\", \"name\": \"How do I reduce feedback whistling when using the sound amplifier?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Start with the volume at the lowest setting before inserting the device. 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