This system incorporates the Electronic Clinometer, a digital display, and a 4 ft. cable. (Cable lengths up to 200 ft. are available. Consult factory for details.) This system works on a 9 volt battery and needs no external power. The display can be mounted up to 200 ft. from the sensor. There are three systems to choose from, ±20 degrees w/ a 0.01 degree resolution, ±45°, or a +90° w/ 0.1 degree resolution.