BRG 440 & 640 Digital Clocks — Our Most Popular 4″ LED Clocks, in Six Versions
By BRG Precision Products | October 28, 2026 | Synchronized Clocks • Digital Clocks
If you’ve seen a BRG digital clock on the wall of a hospital, a school, a control room or a government office, there’s a good chance it was a 440 or a 640. With 4″ bar-segment LED digits and a viewing distance of 100 feet, it’s the size that fits most rooms, and it’s BRG’s most popular digital clock.
The 440 shows four digits (hours and minutes). The 640 shows six digits (hours, minutes and seconds). Both are available with six different ways to keep time, so you can match the clock to your building, your network and your budget.
Pick How Your Clocks Keep Time
| Version | Models | How It Keeps Time | Best For |
|---|---|---|---|
| Stand-Alone | SA440 / SA640 | TCXO oscillator; automatic DST | Best value; single clocks or rooms without network access |
| DuraTime Wi-Fi | WF440 / WF640 | Syncs to your NTP server over your existing 2.4 GHz Wi-Fi | Buildings with good Wi-Fi coverage |
| DuraTime 2.4 GHz Wireless | RC440 / RC640 | Receives time from a DuraTime master clock; each clock also repeats the signal | Large facilities and campuses; runs independently of your computer network |
| Ethernet | EN440 / EN640 | Syncs to your NTP server over a wired network; powered by 110 VAC | Sites with network drops and power outlets |
| PoE | PE440 / PE640 | One Ethernet cable carries both power and time | New construction and renovations; no AC outlet needed |
| DuraTime HP | HP440 / HP640 | OCXO oscillator, factory synchronized to the U.S. Atomic Clock, accurate to one second over 20 years | Secure areas and anywhere you don’t want radios, wires or a network |
Not sure which one is right? Our guide Synchronized Clocks: Which One Fits My Needs? walks through each system.
What Every 440 and 640 Has in Common
4″ Bar-Segment LEDs
Large, bright digits readable from 100 feet — big enough for a classroom, a nurses’ station or an operations floor, compact enough for an office.
User-Changeable Color
Switch between Red, Blue, Green, Yellow, Magenta, Cyan or White any time. Match your décor, your brand, or use a color to mark a special area. BRG clocks have 3X more LEDs than competing products.
12- or 24-Hour Format
Display standard or military time.
Compact Polycarbonate Case
Both clocks are 6.125″ tall and 2.25″ deep. The 440 is 11.88″ wide and the 640 is 16.88″ wide. A black aluminum frame is available as an option.
Mounting Options
Double-Sided — The -2SB models (for example, SA440-2SB or HP640-2SB) put a display on both sides for hallways, corridors and open areas. Ceiling or wall mount.
Recessed — Stainless steel faceplate models mount flush in the wall.
Protected — Lexan clock guards protect clocks in gymnasiums and other high-impact areas.
Key Specifications
| Specification | 440 | 640 |
|---|---|---|
| Digit Height | 4.0″ | 4.0″ |
| Digits | 4 (HH:MM) | 6 (HH:MM:SS) |
| Viewing Distance | 100 ft. | 100 ft. |
| Size (single-sided) | 6.125″H × 11.88″W × 2.25″D | 6.125″H × 16.88″W × 2.25″D |
| Colors | Red, Blue, Green, Yellow, Magenta, Cyan, White (user changeable) | |
Frequently Asked Questions
Q: Should I choose the 440 or the 640?
If people only need hours and minutes, the 440 is the smaller, simpler choice. If seconds matter — in a control room, a lab, a broadcast studio or a hospital — choose the 640.
Q: Can I mix different versions in one building?
Yes. Many customers use PoE or Ethernet clocks where there are network drops and DuraTime HP or Stand-Alone clocks where there aren’t. Call BRG and we’ll help you plan.
Q: Are the 440 and 640 available on GSA contract?
Yes. Many 440 and 640 models are available through GSA Multiple Award Schedule contract # 47QSMS26D002K, SIN 339950. BRG sells exclusively direct with no authorized third-party resellers.
BRG’s most popular digital clock — your choice of six ways to keep time.
Compare All BRG Synchronized Clock Systems →View Stand-Alone Precision Digital Clocks →
Contact BRG Sales: 866-252-2704 or 316-530-8854
4″ LEDs • 100 ft. Viewing • 7 Colors • Stand-Alone, Wi-Fi, Wireless, Ethernet, PoE & HP • GSA Contract # 47QSMS26D002K
