The Battery Powered AX-100TFR is a revolution in the perimeter security industry, offering a significant cost saving alternative to a traditional hardwired system. No trenching or wiring is required, drastically reducing labor time and installation costs. The unit comes wireless ready with a multi functional back box and is compatible with most manufacturers wireless systems. The AX-TFR series comes with four 3.6V batteries (two for each side), with an average lifespan of 5 years on the 100ft model.