Introduction
Thank you for choosing the yomishine Power Failure Alarm. This device is designed to provide critical alerts during power outages or significant voltage fluctuations, helping to protect your valuable appliances and stored goods. Please read this manual thoroughly before use to ensure proper installation and operation.
Key Features
- Loud 120dB Alarm: Triggers a powerful alarm (drill-level loudness) during power outages.
- Adjustable Siren Tones & Volume: Offers 6 distinct alert tones and 4 volume levels for customization.
- Real-Time Voltage Detection: Monitors voltage 24/7 with multi-color LED indicators: Green (110-125V), Red (over 125V), Blue (under 110V).
- 12-Hour Battery Backup: Built-in rechargeable battery provides up to 12 hours of intermittent alarm during outages.
- Auto-Recharge: Automatically recharges within 4 hours after power restoration.
- Integrated Pass-Through Outlet: Plugs directly into a standard 15A household outlet without blocking adjacent sockets, allowing another device to be plugged into the alarm itself.
- GFCI Outlet Design with Surge Protection: Child-safe shutter and 350J surge protection to shield connected appliances.
- Easy Alarm Cancellation: Features a dedicated button to silence the alarm.
Package Contents
- 1 x yomishine Power Failure Alarm (Model YM-10)
- 1 x User Manual
Setup
Before initial use, please charge the product for at least 4 hours to ensure optimal battery performance and prevent low sound or unresponsive buttons.
1. Initial Charging and Placement
Plug the power failure alarm directly into a standard 15A household outlet (US 110-125V). The device will begin charging its internal battery. Ensure the 3-pronged head is fully inserted into the alarm. The compact design ensures it does not block adjacent sockets.

Image: The yomishine Power Failure Alarm plugged into a wall outlet, demonstrating its compact design and the integrated pass-through outlet that does not block adjacent sockets.
Video: A general overview of the power failure alarm, highlighting its compact design and the convenient pass-through outlet feature.
2. Power Supply Monitoring Indication
Once plugged in, the device continuously monitors the power supply. A green LED light indicates a normal power supply (110-125V). In case of a power outage, the alarm will activate, and the LED will flash red.
Video: Demonstrates the power failure alarm in action, showing the transition from normal power supply (green light) to power loss (red light and alarm sound), and how the alarm is triggered.
Operating Instructions
1. Adjusting Alarm Tones and Volume
The alarm features buttons on its side for adjusting settings. Use the 'down arrow' button to cycle through 6 different alarm tones (beeps/buzzers, not sirens). Use the 'up arrow' button to adjust the volume across 4 levels. A silent mode is available, which disables sound but keeps the LED flashing.

Image: A close-up view of the yomishine Power Failure Alarm, highlighting the side buttons used for adjusting alarm tones and volume levels.
Video: Illustrates how to adjust the volume of the power failure alarm using the dedicated volume button, showcasing different sound levels.
2. Cancelling the Alarm
To cancel an active alarm, press the 'Cancel Alarm' button located on the device. The alarm will also automatically cancel once power is restored.
Video: Demonstrates the quick and easy process of cancelling the alarm by pressing the designated button on the device.
Voltage Monitoring and Alerts
The alarm provides continuous voltage monitoring with clear LED indicators:
- Green LED: Indicates a safe and standard voltage range (110-125V).
- Red LED: Alerts to over-voltage (above 125V).
- Blue LED: Alerts to under-voltage (below 110V).
- Flashing LED (Red/Blue/Green): Accompanies the audible alarm during power failure or voltage anomalies.

Image: The yomishine Power Failure Alarm showing its lighting status display, with different LED colors indicating power failure, high voltage, low voltage, and standard voltage conditions.
Battery Backup and Recharging
The built-in battery provides up to 12 hours of alarm functionality during a power outage. The alarm will sound intermittently (15s/60s beeps) to conserve battery life. The battery automatically recharges within 4 hours once the main power supply is restored.

Image: The yomishine Power Failure Alarm showcasing its key features including 12-hour continuous alarm capability and auto-rechargeable battery.
Safety Features
- Child-Safe Shutter: The integrated outlet features a child-safe shutter to prevent accidental shocks.
- 350J Surge Protection: Protects connected appliances from voltage spikes.
- Compact Design: Designed to fit standard outlets without obstructing neighboring sockets.

Image: A visual comparison demonstrating how the yomishine Power Failure Alarm's design allows for full use of adjacent outlets, unlike some other devices.
Applications
This power failure alarm is ideal for monitoring power to critical appliances and areas, including but not limited to:
- Freezers and Refrigerators (to prevent food spoilage)
- Basements and Garages (for general power monitoring)
- CPAP Machines and Oxygen Generators (for essential medical equipment)
- Aquarium Air Pumps (to protect aquatic life)

Image: A visual representation of various applications for the yomishine Power Failure Alarm, including refrigerators, freezers, CPAP machines, and aquarium air pumps.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Alarm sound is low or buttons are unresponsive. | Insufficient battery charge. | Charge the product for at least 4 hours. |
| Alarm does not sound during a power outage. | Device not properly plugged in, battery depleted, or silent mode activated. | Ensure secure connection, recharge battery, check volume settings. |
| 3-pronged head cannot be fully inserted into the alarm. | Manufacturing defect or obstruction. | Contact customer support for exchange or return. |
Specifications
- Model Number: YM-10
- Brand: yomishine
- Noise Level: 120 Decibels
- Control Method: Touch
- Power Source: Battery Powered (rechargeable)
- Battery Type: 1 Lithium Ion battery (included)
- Average Battery Life (Alarm): 12 Hours
- Recharge Time: Approximately 4 hours
- Product Dimensions: 9L x 5.3W x 4.9H Centimetres
- Item Weight: 109 g
- Voltage Compatibility: US 110-125V
- Surge Protection: 350J
Warranty and Support
yomishine offers dedicated after-sales service. If you encounter any product problems or require assistance, please contact us. We are available 7 days a week, 24 hours a day, for prompt support or a replacement if needed.
For returns or exchanges due to manufacturing issues (e.g., 3-pronged head not fully inserting), please reach out to our customer service team.