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Increase the volume for your ears, listening up sound amplifier will pickup the sounds around you and amplifies them for easy-listening. A.Max. output128±4 dB B.Max. increasing 40±5 dB C.Distortion≤101000 HZ D.Noise30 dB E.Frequency rang3004500 HZ F.One AAA batteryDC 1.5V G. Direction: all around to sounds, built-in sound input.
Packing:1pc/blister card120pcs/ctnctn size:45×24×34cm N./G.weight: 8.5/9kgs