Zareba Red Snap’r Predator Repellant Electric Fencing System
The yellow wires generate an intermittent shock which repels animals.
FMI: http://www.zarebasystems.com/products/fence_planning_electric_faq.aspx#2

How safe is electric fencing?

Electric fencing is very safe.
There is at least one second between each pulse of electricity in all Zareba capacitive-discharge controllers. This prevents prolonged shocking to animals or people. In addition, the short on-time, normally 1/10,000 of a second, prevents heat build up. All Zareba fence controllers are designed to meet Underwriters Laboratories (U.L.) approval and specifications. UL tests fence controllers to make sure that they pass stringent safety measures. Having a short "on time" and then having the "off time" between shocks is what makes the fence controller safe to use.

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