• Loud, honest, and clear sound amplification
• Acoustic filters provide clear and smooth sound
• The volume control buttons on the device
• Built-in rechargeable lithium battery
• Compact and lightweight design, it is simple and easy to use

Specifications:

• Output power: 3.6mW
• Maximum sound output: 130±3dB
• Sound Gain: 35±5dB
• Frequency range: 100-4000 Hz
• Equivalent input noise: ≤32dB
• Harmonic distortion: ≤10%
• Continuous working time: ≤15 hours
• Battery capacity: 40mAh battery (rechargeable battery)
• Working current: ≤3mA
• Working voltage: 1.2V
• Speaker Impedance: 120 ohms