DARDENNE PRAIRIE, Mo. (AP) — Bomb squad members have rigged special chirping Easter eggs for children with special needs to hunt in eastern Missouri.

The St. Louis Post-Dispatch reports that Cpl. Steve Case says it took his crew about 10 minutes per egg to wire a switch to a nine-volt battery and a small speaker. The beeping sensors made it easier for visually impaired children to find the eggs during a hunt last weekend at a park in St. Charles County’s Dardenne Prairie.

Case says watching the children hunt the eggs makes all the burns from the soldering irons worth it.

The event was organized by the St. Charles County Parks & Recreation Department and the St. Charles County Police Department.