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The GLG-4000 is a small, exceptionally powerful tracking device designed specifically for use in the mountainous, cave-riddled border regions of Afghanistan. Despite its powerful transmitter, it is still small enough to be implanted inside a human body. Casey explains that "I'll place this GLG-4000 inside Ahmad's pacemaker before it's implanted. When he returns to Hassan Khalid's secret cave, he'll be a high-tech human bug. Then not only will we know the terrorists' secret location, but we'll be one step ahead of their plans." The device was used in Chuck Versus the Broken Heart.

With the use of Dr. Woodcomb's card key, Casey entered the hospital's restricted area and planted the GLG-4000 in Ahmad's pacemaker.

It is also noted by Casey that you would need at least six feet of solid steel to block the signal.

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