Features: This AAA to AAA adapter box converts AAA battery to standard AA battery size This battery conventer is perfect for emergency-situations. High quality durable clear plastic material for long term use. The adapter is designed convex-fixed slot, so that the combination of two ends no longer solely relies on the precise of the material for fix. The positive electrode (mark with "+") adopts an nickel-plated positive electrode cap, which is appliances with deep positive electrode slot. It increases the internal contact area, greatly reducing the contact resistance; Specifications: Material:Plastic Option Type:White AAA to AA Battery Converter no Outer Metal Contact on Bottom;Blue AAA to AA Battery Converter no Outer Metal Contact on Bottom;White AAA to AA Battery Converter with Outer Metal Contact on Bottom;Pink AAA to AA Battery Converter with Outer Metal Contact on Bottom;AA to Size C Battery Converter; AAA to AA Battery Converter Size:Approx.14x50mm/0.55x1.97in AA to C Battery Converter Size:Approx.25x50mm/0.98x1.97in Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10xBattery Adapter