Sinvitron LED Safety Light 2 Pack - Nighttime Visibility for Runners, Cyclists, Walkers, Joggers, Kids, Dogs, Relays & More - Clip to Clothes Strap to Wrist, Ankle, Bike, Collar, and More EXCELLENT DESIGN: Slim, lightweight, and super bright safety lights with 3 high-powered LEDs per device & 3 lighting modes - steady (always on), slow flash, and fast flash (strobe). High capacity batteries included with a battery life of up to 96 hours or more. BONUS ACCESSORIES: 4 extra CR2032 batteries (2 sets), 2 LONG & ELASTIC Velcro straps (mount the lights to dog collars, leashes, bikes, strollers, ankles, wrists, arms, helmets, canes, wheelchairs and more), plus a mini-screwdriver for a NO-HASSLE battery replacement process. EASY TO USE: Strong, no-slip clip attaches easily and stays on securely. Hook onto your belt, pockets, smartphone armband, running gear, reflective vest / belt, backpack / helmet, dog collars / harnesses, anywhere on your clothing, or onto the included elastic Velcro straps. WEATHER RESISTANT: Rain or shine, summer or winter - any weather condition, any time - enjoy enhanced visibility and comfort knowing you'll be safe and secure at any time of the day. ULTIMATE VERSATILITY: No matter what brings you out at night or during inclement weather, our Safety Lights can help to keep you safe. When you're running, walking, cycling, changing a tire, or just getting some fresh air, these will keep you SAFE and VISIBLE. A MUST-HAVE for any low-light situation when YOUR SAFETY RELIES ON YOUR BEING SEEN.