Volume can be adjusted; mini hearing aid hang behind the ear
Max saturation pressure level: 125DB ±4DB
Max acoustic gain ≥38DB
Frequency response range:450-3800Hz
Harmonic distortion (F<1000Hz: ≤ 15%, F> 1000Hz: ≤10%)
Equivalent input noise level: ≤30dB
Use button battery
1) Amplify sounds up to 40 decibels; 2)Weight less than 10 grams; 3)Adjust volume as your wishes; 4)Adjust to either ear  Packing: plastic+color box

carton size: 51×35×19.5/100PCS
N.W.: 13.6KG
G.W.: 14.6KG
20’: 77500

carton size: 44*36*23.5/100PCS
N.W.: 7.4KG
G.W.: 8.0KG
20‘: 72500