Monster C90 True Wireless Bluetooth Headphones
User Manual and Guide
Product Overview
This document provides comprehensive instructions for the Monster C90 True Wireless Bluetooth Headphones, detailing their features, operation, and specifications.
Product Parameters
| Bluetooth version | V5.4 |
| Transmission distance | ≥10m |
| Driver diameter | Φ15*11mm |
| Driver impedance | 16Ω±10% |
| Sensitivity | 118±3dB |
| Frequency response | 20Hz-20KHz |
| Battery capacity (Charging case) | 300mAh 3.7V |
| Battery capacity (Headphone) | 38mAh 3.7V |
| Charging time (Charging case) | ≈1.5 hours |
| Music playtime (Headphone) | ≈6 hours |
| Music playtime with charging case | ≈24 hours |
Package Contents
- Headphones *2
- Charging case *1
- Instructions Manual *1
- Type-C Charging cable *1
Product Schematic Description
The product consists of headphones and a charging case. Key components include the headphone unit with a voice outlet and function touch keys (MFB), the charging case with a Type-C charging port, and indicator lights. These are designed for wireless audio playback.
Indicator Guide
| Mode | Description | Sound prompt |
|---|---|---|
| Power On | Headset ice blue light blinks three times | "Power on" |
| Power Off | Red indicator on the headset will be on for 1 second | "Power off" |
| Pairing | Ice blue and red light flashes alternately in the main ear, secondary ear extinguished | "Pairing" |
| Connected | Headphones LED indicator is off. | "Connected" |
| Disconnected | Ice blue and red light flashes alternately in the main ear, secondary ear extinguished | "Disconnected" |
| Low Battery | Red indicator on the headset blinks | "Battery low" |
| Charging case low power | Ice blue indicator of the charging case is always on | |
| Charging case charged | Ice blue indicator of the charging case blinks | |
| Charging case fully charged | Red indicator of the charging case is steady on |
Charging the Charging Case
Connect the charging case to a 5V power adapter using the provided Type-C charging cable. Rated input: 5V 30mA (Headphone), 5V 300mA (Charging case). Tip: When the charging box cover is closed and the indicator light flashes ice-blue, please charge the charging box.
Product Operating Instructions
1. Power On
Method 1: Open the top cover of the charging case, take out the headset; it will turn on automatically.
Method 2: Long press the MFB button of the left/right headset for about 3 seconds.
2. Power Off
Method 1: Put the earphones back into the charging case; they will turn off automatically.
Method 2: The device automatically shuts down after 3 minutes of disconnection from the Bluetooth device.
3. Pairing
Step one: Open the top cover of the charging case, take out the headset and turn it on automatically.
Step two: Open the Bluetooth list on your smart device, search for "Monster Maxstar MQO36" to pair. A "Connected" tone will be heard upon successful connection.
Note: Headphones will attempt to reconnect to the device within 3 minutes when connection is lost. Fully charge the headphones and power off before an intended period of not being in use. Unplug the charging cable after charging.
Operation
Voice Assistant
Long press left MFB for 2 seconds.
Volume Control
Volume +: Click right MFB.
Volume -: Click left MFB.
Music Playback
Pause/Play: Double click Left/Right MFB.
Last song: Triple click left MFB.
Next song: Triple click right MFB.
Phone Calls
Answer/Hang up: Double click the left/right MFB.
Reject call: Long press left/right MFB for 2 seconds.
Mode Switching
Game mode: Long press right earphone MFB for 2 seconds.
Music mode: Long press right earphone MFB for 2 seconds.
Restore Factory Settings
1. If the headset is not paired with a Bluetooth device after powering on, pair the left/right headset successfully. Then, click the left/right headset 5 times to turn it off (clearing all pairing and connection information).
2. In the connected state, tap the left and right headphones five times, then long press for 10 seconds within 3 seconds, and then power off (clearing all pairing and connection information).
Headset Wearing Instructions
Follow these steps for a secure and comfortable fit:
- Take the earbuds out of the charging case.
- Using the illustrated method, hold both sides of the earphone stem with your thumb and index finger, and use your middle finger to push open the front and rear earphone cover parts to maintain this state.
- For example, the left earbud covers on both sides of the ear are clamped on both sides of the ear. Adjust to the middle and lower position of the ear, aligning the speaker's sound outlet with the ear canal. Repeat for the right ear.
- Take the left ear as an example, wear headphones to enjoy your music.
Precautions
- Avoid using headphones at high volume for extended periods.
- Keep headphones away from dust and water.
- Do not disassemble the headphones or accessories; this will void the warranty.
- Keep headphones away from any impact or vibration.
- Do not use chemical solvents or cleaning agents on the headphones.
- Clean charging contacts regularly with alcohol using a cotton swab for smooth charging and to avoid poor contact.
- Battery safety: Do not expose to heat, disassemble, puncture, or incinerate. Do not use if swollen. Do not place in high-temperature environments or use after water immersion.
- Due to the wireless connection, slight audio delays may occur due to environmental factors, phone brand, or usage behavior. This is normal.
Warnings
1. Do not use headphones at high volume for an extended period.
2. Keep the headphones away from dust and water.
3. Do not disassemble the headphones and accessories, otherwise warranty will be voided.
4. Keep headphones away from any impact or vibration.
5. Do not use any chemical solvents or cleaning agent on the headphones.
Hazardous Substances Information
This table is compiled according to SJ/T 11364.
| Name of the Parts | Hazardous Substances | Pb | Hg | Cd | Cr(VI) | PBB | PBDE |
|---|---|---|---|---|---|---|---|
| Housing | O | O | O | O | O | O | |
| Loudspeakers | O | O | O | O | O | O | |
| PCBA | X | O | O | O | O | O | |
| Accessories | X | O | O | O | O | O |
O: Indicates that this hazardous substance contained in all of the homogeneous materials for this part is below the limit requirement in GB/T 26572.
X: Indicates that this hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit requirement in GB/T 26572.
Warranty Service
Dear user, this warranty card is the proof of your future warranty application. Please cooperate with the seller to fill it out and keep it for future use!
User Information
User name: [Placeholder]
Contact number: [Placeholder]
Mailing address: [Placeholder]
Email: [Placeholder]
Postal code: [Placeholder]
Product Information
Product name: C90 True wireless Bluetooth headphone
Product number: [Placeholder]
Product barcode / Serial number / Batch number: [Placeholder]
Vendor Information
Name: [Placeholder]
Address: [Placeholder]
Contact number: [Placeholder]
Sales date: [Placeholder]
Postal code: [Placeholder]
Invoice number: [Placeholder]
Remark: [Placeholder]
Certificate of Approval
Product No.: [Placeholder]
Production Time: [Placeholder]
QC: PASS
FCC Compliance
FCC Warning: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Caution: Any changes or modifications to this device not explicitly approved by the manufacturer could void your authority to operate this equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 0cm between the radiator and your body.
