This Water activated Aerator starts automatically once in water. The sleek, modern design of this Aerator offers a compact size and big performance. The intention of this device is to keep live bait, stay alive for longer in a bait bucket/container. Operating on 3 C batteries, this device can aerate 1.5litres of water per minute and has an 18 hour run time. If you want to keep your bait alive longer, you can extend the runtime with an interval setting where it can run for 36 hours.