Features:Sound amplifier helps to amplify sound up to 30X with low background noise.Built-in battery, it is convenient to recharge.There is no battery required to replace again.Fully charged replaceable artery can stand up to 8-10 hours continues use.Best hearing keep the ear tips clean and replace.Interchangeable ear tips to seal out the noise.Specification:Plug Type: US/EUBattery: 1.2VWorking Current: Less Than 3mASignal to Noise Ration: Less Than 28dbFrequency: 100-4000HzGain: 30dbDistortion: Less Than 6%Material: ABSSize:145*105*60mmNote: Actual color may be slightly different from the image due to different monitor and light effect.includes:1 x Hearing Aid(with 1 earbuds)1 x Charger1 x Base5 x Silicone Earbuds1 x Brush