These are great additions to any Collar when the sun starts to set. We even use these for cats when we let them outside in the yard at night. Easily clips to the D-ring on your pet’s collar, Keys or can be even used for camping for marking ropes or areas 3 modes: Solid light, slow blink and fast blink Rechargeable: Equipped with a charging cable, which can be connected to devices with a USB source port for charging, such as power bank, computer, etc. In addition, there is no need to replace the battery, which saves cost and is environmentally friendly. To activate squeeze the light with slight pressure. Once for solid light, twice for fast blink and three times for slow blink. The Fourth time will deactivate the light. Multi-color has 3 modes white flash, white strobe and multi color. Multi color mode activates for 5 seconds with 5 seconds break intervals About Us: We are a Veteran/Family owned and operated small business family located in Southeastern Washington. Our Mission: Offer products that we use, love and enjoy! Our Guarantee: We stand behind all our products. If you have any questions or comments, please reach out to us and we will respond as soon as possible.