Stafix X3 Unigizer Powers up to 30 km (45 acres / 18 ha) 3.0 J max. output energy (4.5 J stored energy). The Stafix X3 Unigizer is a sophisticated, high-performance crossover energizer designed for small to moderate-sized fencing systems. Suitable for the control of all livestock types, the X3 combines high performance and reliability with an array of innovative features that continues the tradition of excellence for which Stafix is renowned.