The key specifications and special features of the charger you mentioned are as follows:

1. Charging Capability: The charger is designed to charge 1-4 pieces of AA or AAA batteries. It provides a convenient solution for charging multiple batteries simultaneously.

2. Quick Charging: The charger is equipped with quick charging capabilities, allowing for faster charging times compared to standard chargers. This feature enables you to recharge your batteries more efficiently.

3. AC Cable: The charger comes with an AC cable that allows you to connect it to a power source for charging. This cable provides the necessary electrical power to charge your batteries.

4. Packaging Note: Please note that the original boxes of the charger may have been replaced with another box for transport protection. This ensures that the charger is adequately protected during shipping and handling.

It is important to refer to the product documentation or consult with the manufacturer or authorized resellers for specific technical details, safety instructions, and compatibility information regarding the charger.