Indonesian students invent pinger to find quake victims

Indonesian soldiers removing debris from a house damaged by a strong earthquake in Pandeglang, Indonesia, on Aug 3, 2019. Sitting on the so-called Pacific Ring of Fire, Indonesia is frequently hit by earthquakes, sometimes strong enough to collapse buildings. — AP

JAKARTA: It's the size of a credit card and about as slim.

But if you're trapped under rubble after an earthquake, it just might save your life.