. >> arma tech c.e.o.onstrates how the gun can only be fired for eight hours once the pin code is activated, and as long as the watch is within 10 inches of the gun. >> i want to try out the personalised version. >> great. >> i have the watch, i'm the only one that can use it, right? >> correct. >> reporter: that's because the gun and watch communicate by radio frequency. an electronic chip in the watch signals to another chip in the gun, telling it to unlock. both are operated by regular household batteries. >> my only apprehension is in the heat of the moment when there's an intruder, can i get the watch on, activate it. i'll think about saving my life. how will i have the wherewithal to use the technology. >> the most important thing is comfortable. >> what if the unauthorised user gets the watch and the handgun. >> if they feel the watch and gun. >> what if someone tries to take the gun. we have a demonstration with an unloaded ip1. >> if someone was wroteling me trying to take the firearm. as long as