- Clear Sound
- 4 batteries free
- Max sound output: 130±5dB
- Sound gain: ≥50dB
- Total harmonic wave distortion: ≤10%
- Frequency range: 300~4000Hz
- Input noise: ≤30dB
- Voltage: DC 1.5V
- Current: ≤4mAUsage
- Open the cartridge cover, put the battery in the correct position. Zine Air battery is the best choice and has a longer life.
- Before using, make sure that power is turned off, or make the volume to “l”.
- Put the ear hook on your ear, plug in the ear tightly. Note:The unit is on “off” position, and volume is on “l”, otherwise the instant sound will make you uncomfortable.
- Turn the power, and adjust the sound volume to get clear sound,
- If you hear the whistling sound, please check whether you have plugged in the earplug tightly. If it can’t be plugged tightly, please change the other size plug