Portable Scores DigiTally is a small remote controlled scoreboard. It is intended for small competitions or events where a large scoreboard is impractical but where there is a desire to display the score to the group. 
- Little leagues - Soccer, Football, Baseball
- Adult leagues - Softball, soccer, ultimate frisbee, tennis.
- Schools - School sports such as track, volleyball, wrestling, basketball, football, etc.
- Gyms - Interval training, swimming.
- Camps - There are nearly 8,000 sports camps each year.
It could also be used for informal home use.
It can display numbers unrelated to score keeping:
- Timing meetings or speeches.
- Displaying any numbers for any reason
- School non-sport extracurriculars, like debate and academic bowl
I talked to PortableScores founder Bob Baddeley about some of the technical details. 
The remote control protocol is Bluetooth Low Energy (BLE), allowing a smartphone app to control it. It comes with a remote control for people who prefer the simple interface or do not have a phone with BLE.
When controlled by BLE, the scoreboard can display any numbers the software sends to it. For example, in our Madison, WI hackerspace they have a scoreboard displaying the number of supporters of the project on Kickstarter. You can go the hackerspace live cam and watch the scoreboard respond to your commitment.
PortableScores first tested inexpensive remote controls in an effort to keep the cost down. They tested them in various environments against sevel BLE modules and concluded that the robustness of BLE is worth the cost.
The supply to the LEDs is 9V generated by a buck converter from the battery voltage. The processor runs on a 3.3V supply generated by a separate buck converter. Each digit segment pulls 60mA from the 9V supply at full brightness. So if all seven segments of all four digits are lit, the LEDs pull 1.68A. LED brightness control works by PWMing. Typical use averages is under 1A of current draw, resulting in three hours of battery life. The included AC adapter pulls 16W with all segments lit, as expected based on 1.68A * 9V = 15.1W. 
The segments are made of several 1206 LEDs mounted on a circuit board. Looking at the product, you can’t tell that the LEDs are mounted are a circuit board. It just looks like a high-end 7-segment display. Having everything mounted on a single board means no wiring harnesses, which would add cost and potentially be more prone to failure. They tested it outside on the sunniest days, and it did not wash out in the direct sunlight.
There are many startups working on smartphone apps or websites. It seems like there are at least ten of them for every one company that develops hardware. It’s much harder to put together a minimum viable product in the hardware world. It’s easy to build prototypes, perhaps in quantities sufficient for a "concierge MVP" run, but to build in any quantity you have to build more. Otherwise the cost of setting up the machines predominates. Bob Baddeley has put enormous effort into getting all aspects of the scoreboard working in a way he can be proud of. It will be interesting to see how it evolves after he gets more user feedback.