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

Input:
Product title: Bem Speaker Bravo
Product description: The speaker bravo is the newest edition to bems critically acclaimed Bluetooth speaker line. With Features like speaker phone mode, dual drivers for incredible audio, and an 8 Hour built-in rechargeable battery, and you're got a portable speaker worthy of applause!
Product feature: Passive speaker for incredible bass response, Built-in rechargeable battery (6-8 hours), Microphone for speaker phone function, Pause / play, vol. + and vol. -Buttons, Charges via Micro USB port(cord and Adapter included)
Product brand: Bem
Target attributes: Configuration
Answer: attribute: configuration
value: None
source: None