With its metal grip clip and D-ring, this small, lightweight device is easily attached to clothing or belts. The Grace Industries light tracker can be seen at a distance of up to one mile. LITE TRACKER is built to precision standards and is made of tough polycarbonate plastic, making it virtually indestructible. LITE TRACKER is waterproof, making it ideal for marine applications. This personal flashing safety light is an excellent choice for use on personal flotation devices with the U.S. Coast Guard/SOLAS Approval option. This high-quality visual alert system is ready to use when purchased and is equipped with 2 'AAA' Alkaline batteries, which will provide over 50 hours of good light with constant use.