Hanperal Universal Battery Charger i4 Intelligent Li-ion/NiMH 18650/26650/AA/AAA 4 Output .Totally automatic selectable Refresh (Condition) Function. .Capable of charging 1, 2,3, or 4 batteries at a time. .Worldwide voltage capable - 100V ~ 240V AC 50~60 hZ. .Automatic detection of defective batteries. .Automatic Temperature Monitoring - as your rechargeable batteries charge - prevents heat damage.