Description:
Silent Air Battery Back-Up System by PennPlax.
If you worry about how your fish will survive in the event of a power
outage, the Silent Air B-11 Air Pump will give you peace of mind. It
runs on 2 "D" batteries (not included) and plugs into a standard AC
outlet; it detects a power outage immediately and begins to provide
lifesaving bubbles for as long as they're needed. When the power comes
back on, it shuts off to preserve battery life. Built-in on-off switch.
Can be unplugged from wall and used as a portable pump. Includes 18" of
airline tubing and 1 airstone.