The Minelab GPX-4000 Pulse Induction (PI) gold nugget detector is a totally new design. The Minelab GPX4000 features LCD digital readouts and tuning for precise control of power and sensitivity. A powerful new Lithium-Ion battery delivers full power for almost 12 hours. Never before has Minelab offered a more versatile, technologically advanced, yet easy to use gold prospecting detector. The GPX-4000 has more power and performance than anything else on the market!