Features: * Deft miniature hearing aid with low distortion, noise. * Volume can be adjusted to all condition * 3 size of ear pieces + 1 cleaning brush. * Fancy pocket carry box with Auto-shut-off function when close, in case of forgetting to turn off the power. * Battery: 2 x PR41 ( 1.4V Zinc/Air battery ). * SUSD 0.04 per battery * To prevent from children swallowing, battery cover should be torn down with tool. * Standard Frequency : 2500Hz * Out Volume : 24~34dB * Sound Pressure Level : 104~113dB (below 117 dB) * Input Interference level : Below 29dB * Battery current : Below 0.7mA * Battery life: 260 Hours (10 days) * Weight: 3g (include battery) * Operation Temperature : 10℃~40℃ Main Export Markets: * Worldwide