Introduction
This instruction manual provides detailed guidance on the setup, operation, and maintenance of your Fosmon 7 Day Digital Timers. Please read this manual thoroughly before using the device to ensure proper function and safety. These timers are designed to automate your electrical outlets, allowing you to control lights, appliances, and other devices according to your daily or weekly schedule, helping to save energy and enhance home security.
Safety Information
For your safety and to prevent damage to the device, please observe the following precautions:
- The timer is ETL certified, ensuring it meets recognized safety standards.
- Compatible with incandescent, CFL, and LED lights.
- Features a polarized 2-prong outlet to reduce the risk of electrical shock.
- Do not exceed the maximum load capacity of 125V/15A 1875W.
- For indoor use only. Avoid exposure to moisture or extreme temperatures.
- Do not disassemble or attempt to repair the device yourself. Contact customer support if needed.

Image: Rear view of the Fosmon Digital Timer, highlighting its ETL certification and electrical specifications (125VAC, 60Hz, 15A General purpose or Resistive, 10A Tungsten, 1/2HP, 1875W).
Product Overview
The Fosmon 7 Day Digital Timer is a compact and versatile device designed to simplify your daily routines. It features an easy-to-read digital display and intuitive buttons for programming. Its slim design allows for two timers to be plugged into a standard duplex outlet without blocking the second receptacle.

Image: Two Fosmon 7 Day Digital Timers, showcasing their front display and side outlet design.
The timer is equipped with a built-in backup battery that retains settings for over 100 hours during power outages or when unplugged, ensuring your schedules remain intact.

Image: A visual representation of two compact Fosmon Digital Timers plugged into a single duplex outlet, demonstrating their space-saving design.
Setup
Initial Setup - Setting the Clock and Day
Follow these steps to set the current time and day on your timer:
- Charge the Backup Battery: Plug the timer into an electrical outlet to fully charge the internal backup battery. This ensures settings are retained even if unplugged.
- Reset the Device: Use a pin or pen to press the recessed RESET button (RST/RCL) to clear any previous settings and reset the date and time. The screen will show "0:00".
- Select Time Format: Press the SET and CD buttons simultaneously to toggle between 12-hour (AM/PM) or 24-hour format for the clock.
- Set Current Day: Press and hold the SET button for 2 seconds. The day will flash. Use the + or - buttons to select the current day (e.g., MO, TU, WE, TH, FR, SA, SU). Press SET to confirm.
- Set Current Hour: After setting the day, the hour will flash. Use the + or - buttons to adjust the hour. Press SET to confirm.
- Set Current Minutes: The minutes will flash. Use the + or - buttons to select the minutes. Press SET to complete the setup.
The timer's display may be blank if it has been unplugged for an extended period. Simply plug it in for about 10 minutes to charge the backup battery, then perform the reset and time setup as described above.

Image: A Fosmon Digital Timer plugged into a wall outlet, with a person sleeping in the background, emphasizing its quiet operation and easy-to-read screen.
Video Guide: Fosmon 7 Day Programmable Digital Timer Setup
Official setup guide for the Fosmon 7 Day Digital Outlet Timer, demonstrating how to charge the backup battery, reset the device, set the current time and day, adjust for daylight savings, program on/off schedules, and utilize the countdown and random functions.
Operating Instructions
Mode Setting
The timer has three operating modes: AUTO, ON, and OFF. Press the MODE button to cycle through these options:
- AUTO: The timer will follow the programmed ON/OFF schedules. This is the default mode for automated operation.
- ON: The timer is continuously powered on, overriding any programmed schedules.
- OFF: The timer is continuously powered off, overriding any programmed schedules.
How to Program the On/Off Schedule (Up to 10 Programs)
You can set up to 10 individual ON/OFF programs for daily, weekly, or specific day operation:
- Enter Program Mode: Press the PROG + button to navigate to the first ON event (e.g., "1-ON").
- Set ON Time Day(s): Press SET; the day will flash. Use the + or - buttons to select the desired day(s) for this ON event (e.g., individual days, Mon-Fri, Weekend, or all 7 days). Press SET to confirm.
- Set ON Time Hour: The hour will flash. Use the + or - buttons to adjust the hour. Press SET to confirm.
- Set ON Time Minutes: The minutes will flash. Use the + or - buttons to adjust the minutes. Press SET to confirm.
- Set OFF Time: The display will now show the corresponding OFF event (e.g., "1-OFF"). Repeat steps 2-4 to set the day(s), hour, and minutes for the OFF event.
- Program Additional Events: Press PROG + to advance to the next ON event (e.g., "2-ON") and repeat the process for up to 10 programs.
- Exit Program Mode: Once all desired programs are set, press the CLOCK button to return to the current time display. Ensure the timer is in AUTO mode for programs to run.

Image: Illustration showing two Fosmon Digital Timers, one set for an 8:00 AM ON program and another for a 9:00 PM OFF program, demonstrating the capability for up to 10 ON/OFF programs.
Daylight Savings Time Adjustment
To adjust the clock for Daylight Savings Time:
- Press the SET and MODE buttons simultaneously. The clock will advance or go back by one hour. Repeat to revert the change.
Set Countdown Function
The countdown function allows you to turn a device ON or OFF after a preset interval. The timer memorizes the last countdown interval used.
- Ensure the timer is in AUTO mode.
- Press the CD button. The display will show "0:00" and "OFF" will flash.
- Use the + or - buttons to select whether the device should turn ON or OFF after the countdown. Press SET to confirm.
- The hour will flash. Use the + or - buttons to set the desired countdown hour. Press SET to confirm.
- The minutes will flash. Use the + or - buttons to set the desired countdown minutes. Press SET to confirm.
- The seconds will flash. Use the + or - buttons to set the desired countdown seconds. Press SET to start the countdown.
- To cancel the countdown, press the CD button again.

Image: A Fosmon Digital Timer displaying the countdown timer function, indicating it's easy to repeat with the memorized countdown interval.
Set Random Function
The random function helps deter potential intruders by randomly turning your lights or appliances ON and OFF within a specified time frame, making it appear as if someone is home.
- Ensure the timer is in AUTO mode.
- Press the RND button. An "R" will appear on the screen, indicating the random function is active.
- When active, the timer will randomly turn the connected device ON for 10 to 31 minutes between 6:00 PM and 6:00 AM.
- To deactivate the random function, press the RND button again. The "R" will disappear from the display.

Image: A house at night with various lights on, and a masked figure outside, illustrating how the random function can help keep your home safe by simulating occupancy.
Troubleshooting
If you encounter issues with your Fosmon Digital Timer, please refer to the following common problems and solutions:
| Problem | Possible Cause / Solution |
|---|---|
| Display is blank. | The internal backup battery may be depleted. Plug the timer into an electrical outlet for at least 10 minutes to charge it. Then, perform a reset and set the time. |
| Timer not turning ON/OFF at programmed times. |
|
| Random function not working. |
|
| Countdown function not working. |
|
Specifications
| Feature | Detail |
|---|---|
| Model Number | C-10786US |
| Product Dimensions | 3.8"D x 4.5"W x 1.9"H (3.8 x 4.5 x 1.9 inches) |
| Item Weight | 6.74 ounces |
| Electrical Rating | 125VAC, 60Hz, 15A General purpose or Resistive, 10A Tungsten, 1/2HP, 1875W |
| Number of Programs | Up to 10 ON/OFF programs |
| Backup Battery | Built-in, retains settings for over 100 hours |
| Outlet Type | 1 Polarized Outlet |
| Color | Off-white, Black |
| Country of Origin | China |
Warranty & Support
Fosmon stands behind the quality of its products. Your Fosmon 7 Day Digital Timer comes with a Limited Lifetime Warranty. This warranty covers defects in materials and workmanship under normal use.
For any questions, technical assistance, or warranty claims, please contact our dedicated USA-based customer service team. We are committed to providing 24/7 free customer support to ensure your satisfaction.
Fosmon is a trusted brand on Amazon since 2007 and a Minnesota Registered Small Business. Your purchase supports a small business.
For more information or to contact support, please visit the official Fosmon store or refer to the contact information provided with your product packaging.





