A-155 Bluetooth type hearing aid Adjustable Tone Wirele Hearing Aids High Quality invisible sound Amplifier Bluetooth type hearing aid A-155 A-155 is a rechargeable hearing aid with attractive design appearance, it looks like a Bluetooth, work for about 20hours after fully charged Earphone and easy for carry, you can use 2way of with ear hook and without. Product Details: Model Number: A-155 Type: Rechargeable Bluetooth hearing aid Category : Hearing Health Products Feature : Analogue, Rechargeable, Bluetooth Type Color: Black Weight: 9.5g Size: 4.35*2*1.3cm Battery: Lithium battery, its capacity is 70mAh Specifications: Model:A-155 BTE hearing aid Max Sound Output: 127dB 4dB Max Sound Gain: 48dB 5dB Total Harmonic Distortion: 5% Frequency Range: 250~3800 hz Equiv Input Noise: 30 dB Battery: Lithium Battery Working Voltage DC 3.7V Working Current: 4mA Measurement: 4.35*2*1.3cm Special Function Key: Rechargeable,Adjustable Ear Hook Detailed Product Description: Rechargeable, work for about 20hours after fully charged Bluetooth type, invisible, nobody knows it's a hearing aid Built in 70mAh lithium battery, it can work for about 20hours continuously after fully charged. On/Off Switch Volume Control Different size noise prevention earplug Good sound quality, 30 meters away Use the most splendid lithium battery power supply, provides the battery charger, rechargeable for 1000 times