This hearing-aid is safe to use, convenient and practical. It can help user hear the outside sound again, regaining confidence. Mini, lightweight and invisible, comfortable to wear. Suitable for the elderly and those people with hearing loss. Features: The product looks like a BT headset, which can protect your privacy. You don't have to worry about discrimination anymore. Fine quality material, safe and non-toxic. Mini, lightweight and invisible, comfortable for long time wearing without pain. Intelligent noise reduction and Volume adjustable. It can greatly reduce noise, provide clear sound quality. Suitable for the elderly and those people with hearing loss, helping hearing the outside sound again, regaining confidence. Rechargeable design. Comes with a Charging-case for recharging the device anywhere and anytime. Easy to operate and use. Specifications: Material: ABS colour: Black Maximum OSPL90: ≤120dB±3dB High Frequency Average OSPL90: 103dB±4dB Average Gain: 23dB±5dB Frequency Response Range: 300Hz-3500Hz Equivalent Input Noise Level: ≤35dB Total Harmonic Distortion: ≤10% Batterys: * Hearing-aid(Each One): Built-in 3.7V 50mAh Li-ion Polymer Batterys * Charging-case: Built-in 3.7V 300mAh Li-ion Polymer Batterys Package Size: 125 * 90 * 40mm / 4.92 * 3.54 * 1.57in Package Weight: 120g / 4.23ounce Package List: 1 Pair * Hearing-aid 1 * Charge Case