In my opinion the commercial bear fences are sub par compared to one you can build for less cost and weight. Get a D battery unit as the AA ones are short on juice. If in country with trees buy screw in insulators. Bring as much wire as you need and a tensioner for each line. Pretty simple.
THE MOST IMPORTANT thing that all fences in the mountains need is an alternating hot and ground wire setup. I run 5 wires around camp, 3 hot, 2 ground. Sometimes I only use 3 and somtimes when meat is involved I use 7 wires ( bullet proof). You are kidding yourself if you count on the earth to provide your ground (way too dry).
PM me if you need more info