The Insty Connect uses 12v, with a max of 2 amp energy draw. In most cases, the Insty Connect uses just under 1 amp when you have a decent signal. It may require more power as the signal decreases.
Installation note: if you are direct wiring the Insty Connect to 12v, please be sure to check that your wiring is fused in the circuit, and that you test the power source for 12v. Any voltage under 12V may cause the wifi network to randomly turn off (red light is the only one on), or not power up.
Here are some pics that should help you with the install: