MAGNETIC BASE- "Hands Free" emergency light, stick them on a car, boat, or under the hood for any light needs | 15 LED EMITTERS IN EACH DISC- 9 modes of ultra bright light that you can see up to a mile away! | TAKES 3-AAA BATTERIES- Batteries not included | ULTRA DURABLE- Waterproof, Crush proof, Shock proof | ALERT ONCOMING TRAFFIC OF ANY EMERGENCY- Can be seen up to 5000 feet by oncoming traffic