Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Gomadic Advanced HTC HD2 compatible AA Battery Pack Charge Kit – Portable power built with upgradeable TipExchange Technology
Product description: There are always times when our HTC HD2 seems to run out of power at the most inopportune times. Without a conventional charging source in sight, we are often left with no recourse other than to let the battery run out. Enter the Gomadic Portable Emergency AA Battery Charger for the HTC HD2. Simply insert a fresh set of batteries into the battery pack, toggle the on/off switch and connect your HTC HD2. Instantly the device will start to charge and you will be up and running again. Backed by our Gomadic Lifetime Warranty and over 10 years of innovation in charging accessories, we think you will find this to be one of your favorite accessories!
Product feature: Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (HTC HD2 specific), TipExchange enabled (Yes), Integrated circuitry regulates output voltage specific to the HTC HD2. Advanced logic maximizes overall charger efficiency., Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors., Safely engineered with reverse polarity protection, in the event batteries are accidentally put in incorrectly., Easy to operate. Simply insert batteries, toggle on/off switch and your HTC HD2 will start to charge.
Product price: $21.72
Product brand: Gomadic
Target attributes: Wireless Charging Type
Answer: attribute: wireless charging type
value: None
source: None