Features:-USB Rechargeable, no need to replace the battery, environmental-friendly, with a long standby time.-Built-in intelligent chip, clear and noise-canceling, no worry about the noisy environment.-Strong shell, anti falling and durable, it still can be used normally even if it fell from two meters high.-360° adjustable, suitable for left or right ear to wear.-Ergonomic design, soft and flexible, can help you a lot in daily life.Specification:Maximum sound output: 118+/- 4dBSound gain: >= 32dB+/- 2dBTotal harmonic distortion: <= 7%Frequency: 300-3800MHzInput noise: <=32dBVoltage: DC 3.7VCurrent: <=2mACharging time: 3 hoursNormal working time: 45 hoursColour: silver Package Included:1/2 x Hearing aid1/2 x USB charging cable5/10 x Earb.