You can only activate this card while your Life Points are lower than your opponent's Life Points and the difference is 7000 points or more. Both players' Life Points become 0.
Rulings
Individual Card FAQs
If you activate "Self-Destruction Button", and an effect is chained so that the different in Life Points is less than 7000, "Self-Destruction Button" still resolves because its conditions were correct at the time of activation.
Trap|
Normal