This custom DC-255T-DN-NEG-W Wireless Controlled Digital Countdown Timer is heading to the Texas Medical Association following their shopping cart order placed directly through our main website. Designed for precision timing in professional environments, this unit provides flexible countdown functionality with an automatic negative count up feature once the allotted time has expired. It is ideal for medical conferences, speaking engagements, examinations, training sessions, and regulated presentations where accurate time tracking is essential.

The primary function of the DC-255T-DN-NEG-W is simple yet powerful: the user sets a desired countdown time using the included RF wireless handheld remote controller. When the timer reaches zero, it does not stop. Instead, it immediately begins counting upward while displaying a negative sign on the far left side of the display. This negative indicator clearly signifies that the allotted time has been exceeded, making it especially useful in environments where overages must be visibly tracked.

Using the wireless handheld controller, time setup is intuitive and efficient. The remote includes dedicated buttons for Start/Stop, Set Hours, Set Minutes, Set Seconds, Reset to Last Value, and Reset to Zero. To demonstrate a simple setup, pressing the “Set Seconds” button increments the seconds upward until pressed again. For example, setting the timer to 10 seconds requires pressing “Set Seconds” until 10 appears, then pressing it again to lock in that value. Once Start is pressed, the timer counts down from 10 seconds to zero. After reaching zero, it immediately transitions into count-up mode, displaying a negative sign to indicate elapsed overtime.

One of the standout capabilities of this unit is its shift digit technology. As the timer progresses, the display automatically shifts between time formats to maximize readability and range:

• Hundredths of a second and seconds
• Seconds and minutes
• Minutes and hours

For example, after 60 seconds have elapsed in count-up mode, the display automatically shifts from hundredths and seconds to seconds and minutes. This dynamic shifting allows the unit to display up to 99 hours and 59 minutes while maintaining a five-digit configuration. This design ensures maximum time range without sacrificing clarity.

The remote controller also enables full-hour configurations. For example, setting 15 hours, 10 minutes, and 5 seconds is done by incrementing each section individually using the Set Hours, Set Minutes, and Set Seconds buttons. Once configured, pressing Start begins the countdown from the full 15:10:05 time value. If needed, the Last Value button instantly restores the most recently programmed countdown time, while the Zero button resets the display completely.

Another functional advantage is the ability to start the unit without programming a countdown value. When started at zero, the timer immediately enters count-up mode, displaying hundredths of a second and a negative sign indicator. This provides an efficient stopwatch-style function without additional setup.

Hardware and construction are equally robust, making this unit suitable for professional and institutional use:

• 14-gauge aluminum enclosure
• Black powder-coated finish that is fingerprint and dust resistant
• 2.3-inch LED display digits
• Visibility range up to 120 feet
• Five-digit display capable of showing up to 99 hours to hundredths of a second
• Automatic negative sign indicator during overtime
• 120–240 VAC power wall adapter
• Rear teardrop mounting knockouts for secure installation

The included WRC-6T RF wireless handheld controller provides dependable long-range operation, functioning up to 1,500 feet outdoors and approximately 300 feet indoors. This allows operators to control the timer remotely from across large conference rooms, auditoriums, or event spaces without requiring direct line of sight.

The DC-255T-DN-NEG-W delivers professional-grade countdown timing with clear overtime indication, flexible display shifting, and reliable wireless control. For organizations like the Texas Medical Association, this configuration ensures presenters, moderators, and administrators maintain accurate session timing while clearly monitoring any time overruns.

See product: DC-255T-DN-Neg-W

See tutorial video on YouTube

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