National Geography is tracking dragonfly with tiny (real tiny) transmitters. will try to find about the details of the device (and the manufacturer)
"The transmitters—which weigh 0.01 ounce (0.3 gram) and are about 0.4 inch (1 centimeter) long—are glued to the insects' undersides. A single wire antenna runs the length of the abdomen, and a tiny battery powers the device for up
to a week."
bye for now...