Personal Locator Light. Measures 1 7/8" overall. Black composition housing with clip. Four white LEDs. Three modes: alternating flashing, flashing and steady-on. Alternating flashing: lumens - up to 10, runtime: up to 60h. Flashing: lumens - up to 10, runtime - up to 60h. Steady-on: lumens - up to 10, runtime - up to 45h. Impact resistant - up to 1.5m. Water resistant - up to IPX4. Uses two CR2032 batteries (included). Perfect for biking, jogging, walking or any outdoor activity where you need to be seen in the dark. Hang packaged.