Nano hearing aidAlmost invisible, convenient for attending various occasions. Very small and light, it will not burden the ears even if worn for a long time. Very suitable for most mild to moderate hearing losses.Cutting-edge design: Blue device for the left ear, red device for the right ear, pure white portable charging box. No more batteries, which is perfect for first-time hearing aid users. Changing settings can save battery life. Obvious on/off button for easy operation.Ultra-effective hearing aid: Adopt layered noise reduction and directional feedback cancellation technology to get more natural hearing (this does not mean no noise). By reducing noise, these small devices will bring you back to a clear world.Portable charging box: Put the earphones into the charging box. It can be used for 25 hours after charging for 2.5 hours. (It is recommended to charge once a day). It is as simple as charging a mobile phone: no need to deal with batteries anymore. Convenient to carry and can be put in your pocket.Product parameters: Peak OSPL 90 (dB SPL): 117dBHAF OSPL 90 (dB SPL): 110dBPeak Gain(dB): 32dBHAF/FOG Gain (dB): 29dBFrequency range(Hz): 300-3500HzDistortion: 500Hz: 3% 800Hz: 3% 1600Hz: 3%Equivalent Input Noise (dB): 25dBVoltage: D.C.3.7VCurrent: 1.5mACharging Time(H):4~6hWorking Time(H):20h Battery: Built-in Lithium Battery Current: 1.5mASize: 151020 mmAccessories list:Host x2Charging case x1Earplugs x18Brush x1Cerum stick x8Screwdriver x2Instruction manual x1USB cable x1