Nite Ize Spotlit LED Collar Light withDisc-O-Select - The SpotLit LED Collar Light is a fun and functional way to keep pets visible at night. Set in a lightweight stainless steel carabiner, it attaches quickly and securely to pet collars to keep your animals seen and safe at night. With Disc-O Select technology, you can choose from six different colors making it easier to keep track of multiple animals, or leave it cycling through all the colors in Disc-O Mode. The long-lasting LED is bright enough to be seen from far away and keeps pets visible whether you're on a camping trip or walking in the city. Powered by two replaceable 2016 batteries (included), this little light will keep going for over 20 hours. Weather resistant Secure stainless steel carabiner clip easily attaches to pet collars, harnesses, and leashes Push button on/off New Disc-O Select has six selectable colors and Disc-O color changing mode Battery run time: 20 hours Easily replaceable 2 x 2016 3V lithium batteries included Dimensions: 1.3 x 2.1 x .8 inch