Place safety light right where you need it. The COAST SL1 red safety light is visible from up to a quarter mile away and offers two convenient mounting options-a clip for backpacks, straps, and clothing, and an adhesive pad for helmets, hardhats, and other smooth surfaces. With a max run time of 48 hours, this button-shaped safety beacon fits just about anywhere you need it to send a bright safety signal to those around you. The SL1 features three light modes-solid, flashing, and alternating flashing-for in-the-moment control. When it's time to power back up, the two CR2032 3v lithium batteries can be easily replaced.