Usually, a phaser-grenade remained inert until manually triggered by the person about to throw it.

Typically, on electronically triggered models, an override button is provided in case the user wishes to manually trigger flushing earlier.

Grenade: Grenades must be thrown, and then manually triggered to explode.

Many buildings have interconnected fire alarms that can be triggered manually by pushing a button or breaking a glass plate attached to sensors.

Originally Plastique wore a costume covered with plastic explosives, which she could trigger and detonate manually.

Or even to manually trigger an abrupt explosive release of the warp drive's supplies of antimatter.

A button to manually trigger film rewind is also provided.

Recording may be triggered automatically or manually.

This device could also be triggered manually and have a voice call so you could communicate with the emergency services.

The closing of the sampling bottles is triggered either manually or by an on-board computer.