Fly on the wall! The U.S. Defense Advanced Research Projects Agency is working to develop cyborg insects that carry spy equipment. To make the insects as inconspicuous as possible, miniaturized brain probes are inserted during the pupa stage. The idea is the ultra-light implants will naturally integrate into the body of the developing insect.
Wrist -Watch Walkie Talkie ~ These walkie talkie watches are great fun for both kids and grown-ups, and make a great gift for anyone who loves spy gadgets. Incredibly easy to use, simply strap the walkie talkie watches on to your wrist and you've got an instant communications link within up to a three mile radius. These watches are great for hiking trips, skiing holidays and especially for junior agents storming the enemy's base.
Create a DIY Spy Kit for a kid! Direct link to original post. Instructions are not very in depth, nor does she provide sources for some of the items in the kit, but it's a good starting point. Could also easily be called a "Kid's CSI Kit".
I chose this pin because it is about spying. Polonius would pin this to find out different gadgets and how to use them for spying on his children because he is currently only spying on him with people (himself and Reynaldo).