Manual for SE-NC31C-K

Main Features

• Suppresses up to 90% of ambient noise, great listening even in noisy locations.
• Based on proprietary measurement methods.
• Not all surrounding sounds are eliminated.
• Press monitor button to hear surrounding sounds.

Energy-saving design allows up to 120 hours of continuous listening enjoyment.

• When using Alkaline battery.

Features large-diameter Ø14.2 mm drive unit for high-quality sound.

Noise-canceling function can be switched off when not needed, allowing use as ordinary earphones.

Includes in-flight adapter (dual plug) for use on airplanes.

Set Contents

Confirm the presence of all parts and components before use.

• Earphones
• In flight plug adapter
• AAA manganese battery (1) (for confirming operation)
• Earphone tips, 2 each, S, L (silicon rubber)
• Storage pouch
• Operating instructions (this document)

Names and Functions of Parts

• 1 Power switch: Use to turn noise-canceling function ON/OFF.
• 2 Power indicator: Lights when power is turned on.
• 3 Monitor button: Ambient sounds can be heard while this button is held depressed.
• 4 Battery cover: Press in direction of arrow (triangle) to open battery cover.
• 5 Clip: Use to fix unit to chest pocket, lapel, etc.
• 6 Microphones: These detect ambient sound.
• 7 Earphone tips (silicon rubber): Select from sizes S, M, or L to best match your own ears.

Inserting Battery

1. Press in direction of arrow to open battery cover.
2. Insert battery, taking care to align its + and - polarities correctly.
3. Press in direction of arrow to close battery cover.

When to replace battery

When battery becomes expended, the power indicator will become darker, and sound will appear distorted, with greater than normal amounts of noise. Always replace a new battery. Nominal battery life is as follows when noise-canceling function is used continuously:

• AAA Alkaline battery: About 120 hours
• AAA Manganese battery: About 60 hours
• (Battery life may vary depending on surrounding temperatures and other conditions of use.)

Using the Earphone

1 Connection to AV devices

When connecting the earphones to an airline onboard audio system, use the supplied plug adapter.

2 Using the earphones

Confirm the left/right orientation of the earphones by looking at the “L” and “R” symbols or the earphone color, and place the earphones in your ears. Select the provided earphone tip that best fits your ear size.

3 Playing music

1. When power is ON
   When the power switch is set to ON, the power indicator lights green, and the noise-canceling function operates, allowing you to listen to music without excessively raising the volume, thus eliminating the need to raise sound volume excessively, and reducing disturbance to nearby people.
2. When power is OFF
   When the power switch is set to OFF, the noise-canceling function stops, and the unit can be used as ordinary earphones.
3. When the monitor button is pressed
   While the monitor button is held depressed, playback sound is muted and the noise-canceling function is temporarily stopped, thus allowing you to hear ambient sounds without removing the earphones.
   * This function is enabled only when the power switch is set to ON.

4 Following Use

When not using the earphones, set the power switch to OFF.

5 Precautions

• When disconnecting the cord, grasp the plug and do not pull the cord.
• The furnished in flight plug adapter may not be compatible with the jacks on all airplanes.
• Do not use with airline onboard sound systems under the following conditions:
  – Whenever the cabin crew announces that electronic devices are prohibited.
  – When the use of privately owned earphones is prohibited inside the plane.
• The noise-canceller function is designed to reduce noise primarily in the low-frequency range, and is not effective at reducing high-frequency noise.
• If the earphone tips do not correctly match the size and contours of your ears, excessive sound may escape, or you may sense insufficient bass sound, and the effect of the noise-canceling function may be reduced. Always select and use the earphone tips that best match the size of your ears.
• If the earphones' microphone is covered with your hand or other object, feedback may be caused, resulting in a "howling” sound. In this case, remove your hand or other obstruction from the microphone.