F-137 Earplug Digital Volume Sound Amplifier Adjustable Durable Portable

When you see film, watch the play, have meeting, or have classes, the product can help you to hear the sound clearly and loudly. While in forest, if you want to hear very slight sound, it will be a good choice. Features: 1.Loud & Clear sound, cheap price. 2.Fashion design, comfortable to wear and easy to use. 3.Beautiful apperance, durable. 4.Ear volume control, N-H switch. 5.With "H" low frequency noise reduction 6.CE Approval Specification: Item No.: F-137 Max Sound Output: 1305dB Max Sound Gain: 48dB 5dB Harmonic Wave Distortion: 4% Frequency Range: 450~3500Hz Input Noise: 30dB Battery: AG5 or A13(Zinc air) Working Voltage: D.C.1.5V Working Current: 3mA Measurement: 46*38*9mm Weight: About 92g NOTE: If you hear the whistling sound, please check that whether you plug in the ear plug tightly. If it can't be plug tightly, please change the other size plug. Use for long periods of time, please remove the batteries to prevent battery rot erosion hearing aid components. Please regularly clean the ear plugs or ear molds in order to ensure the normal use of hearing aids. Avoid shock, drop, moisture, and high temperature. Package Included: 1 x F-137 Product 2 x Battery 4 x Earplug 2 x Earplug Connector 1 x User's Manual