These mini betalights have a long life-span of up to five years and they're super bright and powerful. They fit into Kodex spreader blocks and indicators, to make late evening and overnight sessions a bit more enjoyable since you can easily see your gear. The latest bite alarms from Kodex have a night light built in, so you won't need a betalight like this if you're using them, but older alarms like the X10 still make use of these betalights.