The Signal Hound USB-SA44B is a USB-based 1 Hz to 4.4 GHz economy spectrum analyzer and measuring receiver with an RF preamplifier. Using recent innovations in RF technology, the Signal Hound has the sensitivity, accuracy and dynamic range you’d expect in a unit many times its cost. The Signal Hound is powered from the USB cable, eliminating the need for a separate power supply. Measuring less than 8 inches long and weighing only ten ounces, the Signal Hound can be used virtually anywhere!