The Ansmann Energy 4 is a plug-in charger for 1-4 Micro AAA or Mignon AA rechargeable batteries or 1-2 pcs 9V block batteries. - Diagnosis of inserted cells - Automatic refresh/discharge function - Faulty battery detection - Better performance of batteries - Capacity quick test - Intelligent charge control - Super fast charging - Individual charging process for each battery - Worldwide use due to electronic switch mode power supply and interchangeable power supply **With primary plug set and switch mode power supply for worldwide use**