now, these black box pingers don t always work. they didn t work in the case of air france 447. it took two years. and that s why it took two years. yeah. we can t assume that they work but you should be listening. so yes, 30 days is the lifespan of these the batteries, the power of the batteries. got about three weeks left. should be plenty of time. it can t be very far. jeff les, good to have you on. thank you for being here. thank you for joining me. i m poppy harlow in new york. coming up a reported sighting of a tornado in mississippi. a lot of treacherous weather around the country. we ll talk about that. more in-depth coverage of this continuing coverage of search 8501. another hour of cnn newsroom starts after a break.