In stock right now at EB Airsoft is the FMA Voice Activated Reaction Transfer Device, the name of their product  which is a dummy replica of the BlackBox Biometrics, Inc. Blast Gauge System. The original device is made for logging pressure and acceleration from exposure to explosive blasts such as IEDS, RPGs and other explosive devices. The LED lights actually provide triage data when the button is pushed. The logs are retrieved via Micro-USB for immediate analysis by medical personnel.

FMA Voice Activated Reaction Transfer Device lights actually work according to EB Airsoft:

• "This product can be entered in three different modes,  the green light flashes green tag is 0, the blue light is a flashing yellow light marks, red marks are two flashing red lights, functionality is only suitable for use ordinary player dressed in practical wear,  this LED display works well, night wear clearly visible, particularly the need for players to covert action.
• Manufacturer: FMA
• Weight: 65g
• Quantity: one

Functions:

• Long press switch of the power for 3 seconds
• The indicator light is on
• To stimulate the sound control switch
• Signal lamp -- lighting / flashing / off
• Pressed transformation switch,
• The indicator light change color
• To stimulate the sound control switch
• Signal light transfer next (lighting/flashing/off),
• Long press switch of the power for 3 seconds
• The indicator light is off."