The beeping indicates that for some reason the jump starter is unable to charge the battery. You can try to reset the unit to see if we can clear that up.
Plug the power cord in to the portable jump starter
If it starts beeping, press and hold the power button for 30 seconds
After 30 seconds, release the power button and unplug the power cord
Wait 10 seconds, then plug the power cord back in to the jump starter
If the beeping persists, please contact our customer service department at 1-800-531-0004 to arrange for returning your unit for service. We are open Monday through Friday from 8-5 central time.