User Manual 
Safety instructions
Hearing safety:
- Please do not use headphones while driving and charging.
- Please use cautiously and stop using headphones in dangerous situations.
- Please do not listen for a long time at a high volume to avoid hearing damage.
- For your safety, please do not turn the volume too high while running outside to ensure that you can hear sound in your surroundings.
Operation Safety:
- Use original or certified cables for charging and voltage within 6.3V. Power will be cut off and start protection mode when the voltage exceeds 6.3V and within 6V. The headphone will be broken when the voltage is over 36V.
- Keep away from children to avoid danger from improper use.
- Avoid dropping headphones and operating in extreme temperatures. Please use headphones within the operating temperature range: -15 °C (5 F) – 55° C(131 F).
- Do not submerge headphones in the water.
- Do not use corrosive cleaner/oil to clean headphone
- Turn off headphone Bluetooth and ANC function to save power when you do not use headphones.
What’s in the Box
NC25 Headphone *1
3.5mm to 6.35mm Piano Adaptor *1
Portable Carry Case*1
Airplane Adaptor *1 (Only use for airplanes)
Type-C Charging Cable *1
Audio Cable *1
At a Glance
How to Use
Use ANC Function
Use Bluetooth Function
- Hold the Multi-function Button for 3-5 seconds to turn headphone Bluetooth on, then enter pairing mode.(the LED indicator light will be blue and red flashing quickly.)
- Start your mobile phone Bluetooth and find the headphone Bluetooth pairing name “NC25” to click it to pair. (the LED indicator light will be blue flashing slowly after pairing successfully.)
- .Hold the Multi-function Button for 3-5 seconds to turn headphone Bluetooth off.
Double-press the Multi-function Button to reject an incoming call.
Function Details
Easy Paring
- Hold the Multi-function Button for 3-5 seconds to turn headphone Bluetooth on, then enter pairing mode.(the LED indicator light will be blue and red flashing quickly.)
- Keep headphones and your mobile phone as close as possible during the pairing process.
- Turn on your mobile phone’s Bluetooth. Search for headphone Bluetooth signal on mobile phone and click “NC25” to pair.(the LED indicator light will be blue flashing slowly after pairing successfully.)
- If you are asked for a password/PIN code during the pairing procedure, please enter “0000” (four zeros).
Pair to the Second Bluetooth Device
- Please make sure that the headphone is connected to the first Bluetooth device successfully and music is not playing.
- Hold the Multi-function button until the headphone switches off and continue with the steps “Easy Pairing”(Let the headphone re-enter pairing mode, the LED indicator light will flash blue and red alternately).
- Pair headphones with the second device according to the “Easy Pairing” steps.
- Return to the first Bluetooth device and pair it with headphones again. Now both of your devices are paired with headphones.
Active Noise Canceling(ANC) ON/OFF
To turn on ANC, press the ANC Button; (the LED indicator light will be green when ANC is ON.) To turn off ANC, press the ANC Button; (the LED indicator light green color will be off when ANC is OFF.)
Wired Mode
Headphone support AUX input for wired external audio source connection. Simply turn the headphones Bluetooth off and plug in the audio cable. For any ANC Bluetooth headphones, still needs battery power support for wired mode. ANC also works in wired mode. Microphones only work in Bluetooth mode, not in wired mode.
Please note that CAN NOT adjust the volume on headphones in wired mode
Voice Dialing
Press both “Volume Up” and “Volume Down” buttons simultaneously to activate the voice dialing function(compatible with iPhone Siri and selected Android voice dialing software).
How to Wear
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| 100° inward rotation | 120° inward folding | Adjustable Headband |
Airplane Adaptor Connection
Connect the Airplane Adaptor to the audio socket(double holes) of the aircraft seat, and use 3.5mm audio cable to connect with your headphone and Airplane Adaptor.
Warning:
Only used for airplanes,Can not be plugged into the power socket
Headphone Specification
LED Indicator Light
* Please kindly note that perhaps sometimes these
LED indicator light color will be mixed to become other colors(pink, purple,etc.) occasionally.
Technical Specification
- Product name: Srhythm NC25
- Battery capacity: 1000mAh
- Input: 5V 220mAh
- Chip: ATS
- Charging time: About 2 hours
- Use time: 50 hours
- Bluetooth version: V5.0
- Bluetooth profile: A2DP, AVRCP, HSP, HFP
- Bluetooth range: 10m/33ft
- Waterproof rating: IPX4
- Net weight: 180g
- Impedance: 32 Ω
- Driver diameter: Φ40mm
- Frequency response: 20–20KHz
Charging
Use the included Type-C charging cable to connect to the headphone Charging Port. Connect the other end of the charging cable to a computer USB port or USB wall charger under 6.3V voltage. Turn off headphone Bluetooth and ANC function before charging. Please don’t use headphones while charging. The LED indicator light will be off or blue color hen full of charge based on headphone turn-off status. Start your mobile phone Bluetooth and find headphone Bluetooth pairing name NC25 to click it to pair.(the LED indicator light will be blue flashing slowly after pairing successfully.) Hold the Multi-function Button for 3-5 seconds to turn headphone Bluetooth off.
If any issues, here are tips for you:1. Full charge of your headphone(don’t use a fast charger)2. Reset headphones by inserting the audio cable into the headphone audio pocket then removing it. Or the upgraded NC25 headphones would be reset automatically when charging. Delete Pairing: Hold both “Volume Up” and “Volume Down” buttons simultaneously for 5 seconds
QandA
- Q: Why can’t headphones pair with my mobile phone?
A: Please check if your headphone is in pairing mode or reconnection mode, and check if the Bluetooth search function of your Bluetooth device is turned on, if all is done, then go to the Bluetooth menu of your Bluetooth device, delete/ignore the headphone Bluetooth pairing name NC25.After that, you can try to reconnect Bluetooth according to the above “Easy Pairing” steps - Q: Why can’t headphones turn on?
A: Please double-check the battery status of your headphone. - Q: Can I replace the battery in the headphone?
A: No, you can not. The headphone uses a built-in non-detachable
Li-Polymer battery that can’t be replaced. - Q: Can I use headphones while driving?
A: For your safety, we strongly recommend that you do not use headphones while driving to avoid distraction. - Q: Why do headphones sometimes disconnect from A Bluetooth device within 10 meters?
A: Please check if there are any metal materials or obstacles within a relatively close range or your surroundings that perhaps interfere with the Bluetooth connection. This may happen because Bluetooth is a radio technology that is sensitive to objects between headphones and other devices. - Q: Why can’t I hear any sound from my computer or mobile phone?
A: Please check if the output channel of your computer supports the A2DP profile. Also, check the volume settings on your headphone and computer/mobile phone. - Q: Why am I unable to use headphones to control the volume of a track playing on an APP on my mobile phone?
A: Due to configurations of different application software, headphones may not be completely compatible with some apps. English - Q: What do I do if Bluetooth can not close or open?
A: Please reset the Bluetooth function of the headphones by inserting an audio cable into the headphone audio port, then removing it. Before re-connecting,kindly remember to delete/ignore the headphone Bluetooth pairing name NC25 on your mobile phone. - Q: Why does Bluetooth turn off when I connect an audio cable?
A: This is one of our special features. When users insert an audio cable into the headphone audio port, all Bluetooth feature buttons stop working and Bluetooth turns off. But, Bluetooth will be available again when the audio cable is moved. - Q: Why can’t I turn headphones on/off?
A: Please note that ANC and Bluetooth are indicated by the same LED indicator light(but different light colors), with a green light for ANC and a blue light for Bluetooth. f you need to turn Bluetooth on/off, you can turn off ANC firstly in case you make confused by the color lights. But you will be very familiar with the light color meaning after using few times because it is simple and easy. - Q: Why does the audio quality become poor on Windows PC?
A: Some customers have mentioned poor audio quality on Windows PC. Please note that there are “Headset” and
“Headphone” modes you can toggle by changing your output device. Selecting “Headphone Mode” will drastically improve the audio quality.” Headset Mode” is designed or highly compressed VOIP calls, etc. That’s not the fault of the headphone product, that’s just the limitation of that protocol. If you are in “Headphone Mode”, the audio quality is fantastic. - Q： Why is the headphones sound so low?
A: Increase both device and headphone volume. For some software such as SPOTIFY, you may need to turn the equalizer to OFF, then the full spectrum comes through and the volume will be easily adjustable.
