Features: 1.New Wireless Bluetooth rechargeable design mini hearing aid 2.Built-in Ni-MH rechargeable battery,on-off & volume control 3.suitable for moderate to severe hearing loss. 4.Can be connected directly to a Bluetooth-enabled mobile phone Technical Parameters: Max Out 125 4dB Max Gain 38 5dB Frequency Range: 300~ 4500Hz Harmonic Distortion: 5% Equivalent Noise Input: 28dBSPL Voltage 3.7V Current 2mA Product Weight:6.5g Product Size Packing details paper + plastic box Packing Size 45*40*10mm Q.T.Y/Carton 100PCS Carton Size GW 13kg NW 12kg Specification: 1. Rechargeable semi-digital headset. 2. Two listening modes. 3. Suitable for different noise environments. 4. Low power reminder function. 5. Recharge for more than 80 hours at a time