Tape and comparing with normal-size QIC.

UPDATE: 12.2014 - another small QIC tape, manufactured by 3M.

Notice how the tape is loaded in, it sticks out of the streamer and it's a normal thing. Last picture shows power supply pinout (DIN5, 1 - 16V AC 2A, 2 - Center tap, 3 - 16V AC, 4 - GND, 5 - nc)

Update 2022
As there are even forum posts asking how to power this thing, I add my description of its power circuit internals. The most important pins are 16V AC and the center tap. Inside, the Trakker has two linear regulators: 7805 for getting +5V and TIP41-based made on op-amp for +12V. The voltage for 12V is made by the diode bridge from pins 1 and 3 of DIN socket.
Now the Center tap: This is filtered/de-rippled by electrolytic capacitor and put as an input to 7805. As the ground of 7805 is rectified from the AC ends, the center tap has ca. 8V, so 9-10V DC after filtering and with load, which is an input for the 7805.
So the transformer must have 8V+8V secondary windings.

Ah, and the "NC" pin is not NC, but shorted to pin 4, "GND". This is the DC GND, probably to shield the cable.