Abstract: A training grenade uses a high intensity flash to simulate an explosion in a time delayed fashion when thrown and/or a sonic device such as a buzzer for indicating arming. Alternative means to simulate the explosion can include sonic devices or radio frequency sources. An internal power source and firing circuit connected to an internal timer control the activation of the indicator or flash upon closure of an externally controllable switch. The switch can be locked in an open position through the use of a release pin which closes upon removal of the pin or can be held open through the use of a pivotally attached safety lever as used in conventional grenades.

Abstract: An acoustic receiver for interfacing indirect-fire weapons with the Multi Integrated Laser Engagement System ("MILES") responds to the presence of a device when the device generates a predetermined acoustic signal upon simulated explosion. The simulator then momentarily disconnects the MILES power supply from the rest of the MILES circuit. This action causes the MILES to generate an audible alarm indicating a hit by the explosive device.