Amasing Design: These LED safety lights have 3 ultra-bright LEDs light bulb, and with 3 different settings (steady/Slow flashing/fast flashing ).Powered by 2 coin batteries, lasting up to 70 hours in steady mode or lasting up to 96 hours in Strobe light mode. Easy to Use:The battery is already in Safety Lights and can be used immediately It's easy to cilp on, and stays on securely. You can hook on backpacks, helmet,pockets, belt, running gear, armbands. Also you could chain The 4 Velcro straps into one as an armband. Surprising VersatilityThese LED safety lights can be used as warning lights, you can use it in Running, Cycling, Walking, Hiking, Jogging, Camping, Backpack's, Kid's, dog's.These running lights for runners will keep you safe and secure at any time. Weather Resistant: Whether rain or shine, summer or winter, anytime, anywhere, you will enjoy enhanced visibility and comfort knowing. Safety equipment essential for low-light activities.Our running light can protect you at all times Upgraded Bonuses Added: Included 5 extra CR2032 batteries,4 Velcro straps(you can mounting the LED safety light to dog collar , arm and waist,etc),and 1 aluminum carabineer(can clip to put on your clothes or can use the Velcro to secure to a object that you can't clip it ).