The New AX-100TFR and AX-200TFR from OPTEX is a Revolution in the perimeter security industry, offering a significant cost saving alternative to a traditional hardwired system. No trenching is required, drastically reducing 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, with an avg. lifespan of 5 years on the 100ft model and 3 years on the 200ft model.