Are there any beacons that are battery powered that can be used outdoors?

There are plenty of battery powered beacons that can be used outdoors. Most beacons, especially battery powered ones are specifically designed to be used in the outdoors. Many of which fits into the environment the beacon was designed for, such as in a terrain snowy environment. Personels also use such beacons for hunting trips, cave trekking, search and rescue and much more.