Hearing aid lk168 Standard features: Attractive design, small and light. Less noise, fine fidelity and tone. With volume adjustment switch. With on/off switch. Tested according to international standard iec118-7. Specification: Max sound output: 128¡à5db Sound gain: ¡ý38db Total harmonic wave distortion: ¡ü10% Frequency range: 400----4500hz Input noise: ¡ü30db Voltage: 1.5v Current: 3ma Battery: with a675 zinc-air /ag13 button cell Estimated battery life: over 100 hours /35 hours
