Introduction
The Monster Sleep Ear100 Bluetooth Sleep Earbuds are designed to provide ultimate comfort and a peaceful listening experience, especially for side sleepers. Featuring passive noise canceling, a unique sleep mode, and extended battery life, these earbuds aim to enhance your rest and audio enjoyment.
Important Safety Warnings
- Please mind potential fire risk and strictly follow the instruction manual for charging and storage.
- For disposal, please check your local authority's website for more information and dispose of the lithium-ion battery safely in accordance with the applicable legal requirements.
- Private replacement of batteries without permission is not recommended.
- Batteries (battery packs or battery combinations) should not be exposed to lighting, baking, or similar overheating environments.
- The input voltage and current standards for charging the headset charging compartment from an external power source are 5V/1A.
Product Overview
The Sleep Ear100 earbuds are engineered for comfort and sound quality. They feature a compact, lightweight design with soft silicone tips, making them ideal for extended wear, including during sleep. The earbuds incorporate a dual-layer noise reduction system and Bluetooth 6.0 technology for stable connectivity.
Official product overview video showcasing features and design.
Package Contents
Ensure all the following items are present in your package:
- Sleep Ear100 Earbuds × 2
- Charging Case × 1
- Instruction Manual × 1
- Certificate of Conformity × 1
- Packaging Box × 1
- Type-C Charging Cable × 1
Setup
1. Charging
Before initial use, fully charge both the earphones and the charging case. Connect the provided USB-C cable to the charging case and a 5V/1A power adapter.
LED Indicator (Charging Case): The white light will flash slowly during charging and remain solid white once fully charged.

2. Wearing
Place the Sleep Ear100 earbuds into your ears and gently rotate them to achieve a comfortable and secure fit. Proper placement ensures optimal sound quality and comfort, especially for side sleepers.

3. Pairing
Open the charging case and remove the earphones. They will automatically power on. On your device (smartphone, tablet, etc.), enable Bluetooth and select 'Monster Sleep Ear100' from the list of available devices to connect. You will hear system prompts upon successful connection. If previously paired, the earbuds will automatically connect to the last connected device when powered on.
LED Indicator (Earphone):
- Power On: White light flashes.
- Power Off: White light on for 2 seconds, then turns off.
- Pairing Successful: White light on for 1 second, then turns off.
- Pairing Timed Out: White light flashes.
- Disconnected: White flashes.
- Low Battery: White light flashes slowly.

Operating Instructions
Power On/Off
To power on, simply open the charging case cover and remove the earphones. They will turn on automatically. To power off, place the earphones back into the charging case; they will power off and begin charging simultaneously.
MFB Operation (Touch Controls)
The Sleep Ear100 earbuds feature intuitive touch controls for managing audio playback and calls.

- Single Tap: Volume - (Left earbud), Volume + (Right earbud)
- Double Tap: Play/Pause Music (Left/Right earbud), Answer/End Calls (Left/Right earbud)
- Triple Tap: Previous Track (Left earbud), Next Track (Right earbud)
- Long Press (2 seconds): Reject Incoming Calls (Left/Right earbud), Activate Voice Assistant (Left earbud), Enter/Exit Sleep Mode (Right earbud)
Sleep Mode
When connected to your phone, long-press the right earbud for 2 seconds to enter Sleep Mode. Repeat the action to switch back to normal mode. In Sleep Mode, the touch functions of the earbuds are disabled to prevent accidental touches while sleeping. This mode requires both earphones to be in use. If you remove an earbud from the case and it's in sleep mode, it will revert to normal mode, requiring you to re-enter sleep mode by long-pressing the right earbud.
Bluetooth 6.0 Technology
The Sleep Ear100 utilizes advanced Bluetooth 6.0 technology, providing fast, stable, and extended wireless connectivity for a seamless audio experience.

Maintenance
Cleaning
The protective cover (silicone ear tip) of the earbuds can be removed for cleaning. Gently detach the silicone tips from the earbuds. Clean the silicone tips with mild soap and water, then rinse thoroughly and allow them to dry completely before reattaching. Wipe the earbud body with a soft, dry cloth. Ensure no moisture enters the earbud's internal components.

Battery Care
To prolong battery life, avoid exposing the earbuds and charging case to extreme temperatures, direct sunlight, or high humidity. Store them in a cool, dry place when not in use. Fully charge the device before long periods of storage.
Troubleshooting
- Cannot connect via Bluetooth: Ensure the earbuds are charged and in pairing mode. Turn off and on your device's Bluetooth, then try re-pairing. If issues persist, try resetting the earbuds.
- Earbuds not turning on: Ensure the charging case has sufficient battery. Place earbuds in the case, close, then reopen to activate.
- Touch controls unresponsive in Sleep Mode: This is a feature of Sleep Mode. Touch controls are intentionally disabled to prevent accidental activation. To use touch controls, exit Sleep Mode by long-pressing the right earbud for 2 seconds.
- Sound quality for music is not optimal: The earbuds are optimized for sleep and passive noise isolation. While they offer good sound, the frequency response is tuned to avoid harshness, which may affect clarity for some music genres compared to dedicated music headphones.
- Discomfort or poor fit: Ensure the silicone ear tips are correctly positioned and rotated for a snug fit. The ergonomic design is based on extensive ear scans for broad compatibility.
Resetting the Earbuds
In the power-on state, press the MFB (Multi-Function Button) of both earphones 5 times simultaneously. The earphones will automatically shut down to reset. Then, put the earphones into the charging case and take them out; they will automatically turn on and enter pairing mode.
Specifications
| Product Brand | Monster |
| Model | Sleep Ear100 (MHZZZHO) |
| Material | ABS, Plastic, Silica Gel |
| Battery Capacity (Earbud) | 300mAh |
| Battery Life (Sleep Mode) | 80 hours (single playtime), 320 hours (with charging case) |
| Battery Life (Music Mode) | 7 hours (single playtime), 21 hours (with charging case) |
| Maximum Wireless Range | 10m-20m |
| Sound Isolation | Passive Noise Canceling |
| Number of Drivers | 2 |
| Driver Diameter | 6mm |
| Impedance Range | Up to 32 Ω |
| Bluetooth Version | 6.0 |
| Audio Codecs | AAC, SBC |
| Waterproof Rating | IPX6 (Resistant to sweat, water, and rain) |
| Frequency Response Range | 20 - 20000 Hz |
| Sensitivity | 109 dB |
| Resistance | 32 Ω |
| Wearing Method | In-Ear |
| Charging Interface | Type-C |
| Earbud Dimensions (LWH) | 20.3 x 14 x 26.5 mm |
| Charging Case Dimensions (LWH) | 56 x 26.5 x 43 mm |
| Earbud Weight | 3.1g |

User Tips
- These earbuds are highly effective for listening to ASMR or podcasts, especially for those who struggle with sleep or anxiety.
- The low-profile design makes them very comfortable for side sleepers, with minimal pressure on the ear.
- When using for music outdoors, you might need to increase the volume to clearly hear vocals due to the passive noise isolation.
- The Sleep Mode is excellent for uninterrupted rest as it deactivates touch functions and low battery beeps.
- Their compact size and secure fit make them suitable for use under a motorcycle helmet for GPS audio, though the microphone may not function optimally in this scenario.
Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official Monster product website or contact your retailer. Keep your proof of purchase for any warranty claims.
A user manual in PDF format is available for download: View User Manual (PDF)
Compliance Information
FCC Statement
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. 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 the receiver.
- Connect the equipment to 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.
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. The device has been evaluated to meet general RF exposure requirements and can be used in portable exposure conditions without restriction. FCC ID: 2AVD2-MH22280
IC Caution (Canada)
This device contains license-exempt transmitter(s) that comply with Innovation, Science and Economic Development Canada's license-exempt RSS(s). Operation is subject to the following two conditions:
- This device may not cause interference.
- This device must accept any interference, including interference that may cause undesired operation of the device.
The device has been evaluated to meet general RF exposure requirements and can be used in portable exposure conditions without restriction. IC: 28HM37-MHZ2280