The Xbox 360 Wireless Controller AA-Battery Back Cover Pack is a replacement case shell designed for Xbox 360 controllers. 

Here are its features and specifications:

1. Condition: 100% Brand New and High Quality!

2. Compatibility: Designed for Xbox 360 controllers.

3. Battery Hold: Holds 2 AA batteries (batteries not included).

4. Craftsmanship: Meticulously crafted surface for a polished look.

5. Perfect Fit: Matches with your controller perfectly.

6. Conductive Copper Pieces: Built-in conductive copper pieces with electrodeposition, preventing rust.

Specifications:

- Material: Plastic

- Dimensions: 5.5 x 3.5 x 1.8 cm (L x W x H) Approx

- Color Options: Black, White

- Compatibility: Compatible with Xbox 360 controllers.

This replacement pack is a convenient solution for users seeking a new battery cover for their Xbox 360 Wireless Controller, offering a fresh and durable shell for continued gaming.