If you or your dog can dish it out, this signal light can take it. Great as a primary or backup collar light. Unbreakable lifetime LED pumps out nearly 10 lumens of brilliance that can be seen up to 2 miles away. Included lithium ion battery provides more than 100 hours of steady light or over 250 hours in flashing mode. Waterproof to 300 ft. Available in colors: Red, Clear,Orange, Blue, and Green.