Screen or no, the important features of battery alarm are:
- LOUD (check)
- Adjustable (can change the alarm voltage, which that guy can't)
ugly as it is, the 80's 7-segment display version has a button between the the beepers that lets you change the alarm voltage. the cheapo LED version does not.
now if you have some 3/4" clear shrink tube, you can remove that plastic black box and you'll get something like this:
View attachment 40355
I have several and almost all my airframes use them to signal time to land -- the only exceptions being those that are too light and my multirotors that have it built into their control board.