A quality D battery has eight times the capacity (milliamp hours) of a comparable AA battery. This allows the 12 D batteries in the Power Bank to have up to four times the power of the eight AA batteries in the camera. More power enables the camera to run longer and take higher quality night images. This is critical in subfreezing temperatures. The camera will draw power from the Dual Power Bank first saving the batteries for reserve when the D batteries fail Dual Power Bank attaches to the tree with an included Genius Mount. Compatible Cuddeback cameras slide on and off the built-in Genius Mount of the Dual Power Bank Includes Dual Power Bank battery box 2 Cables and Genius MountCompatible with Cuddeback camera Series : G Series J Series K Series Requires 12 x D batteries Compatible with Cuddeback Genius Mounts One included cable for setup (36? cable) Two Power Cables