Thumper

A thumper is a short stake with a spring-loaded clapper on one end. With the catch released, the thumper would pound repeatedly. It was used to summon a sandworm on the planet Arrakis.

Some thumpers also had a candle, which, when lit, would last for approximately one hour. After the candle burned out, the catch would automatically be released, and the thumper would begin to pound.