Features 1. High quality battery: Built in high-capacity lithium battery, long working time and recyclable hearing aid. It saves the trouble of purchasing and replacing batteries, which is convenient and easy to worry about. 2. Comfortable: Small and exquisite, comfortable to wear.According to the characteristics of the ear canal design, delicate and compact, no longer afraid of the elderly long-term wear a sense of weight-bearing. 3. Ergonomic design: This product adopts ergonomic design and is very convenient to use.No foreign body sensationMore comfortable to Wear , Not easy to slip and shift. 4. Good quality: This product is made of high-quality materials, exquisite workmanship, very good quality and long service life.This product is made with functional exquisite craftsmanship, and appearance is very stylish and beautiful. 5. Portability: This product is small in size and light in weight, very convenient to carry around.This hearing aid can amplify the sound so that the elderly with poor hearing can hear the sound clearly, which is very practical. This hearing aid is made of durable material and comfortable to wear. It is very suitable for the elderly. It can amplify the sound so that the elderly with poor hearing can hear the sound clearly. Specifications: Material: ABC+silicone Model: F-139 Saturation sound preure level: 129dB+3dB Full range sound gain: 38dB5dB Total harmonic distortion: 10% Frequency response range: 450~3000Hz Equivalent input noise level: 32dB Battery: AG13 Working voltage: D.C.1.5V Rated power supply power consumption: 10mA Package Included: 1 pc * Hearing Aid Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.