Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: 2 Channel 300 Watt Bridgeable High Performance Car Audio Amplifier
Product description: Two Channel Bridgeable Output 2 x 150 Watts Total Output 1 x 300 Watts Output Bridged Mono MOSFET Power Supply Variable Gain Control Built-In Subwoofer Crossover Gold Plated RCA Inputs High Level MOLEX Input Speaker Impedance: 4-8 Ohms Easy Access Speaker Connections Soft Turn-On Circuit Remote Turn On/Off Thermal Overheat Protection Speaker Short Circuit Protection Input Overload Protection Heavy Duty Aluminum Alloy Heatsink Power On LED Indicator Protection LED Indicator Frequency Response: 15-30kHz Signal to Noise Ratio: 95dB Dimensions: 8W x 2H x 10L
Product feature: Two Channel Bridgeable Output, 2 x 150 Watts Total Output, 1 x 300 Watts Output Bridged Mono, MOSFET Power Supply, Variable Gain Control
Product brand: Legacy
Target attributes: RMS Power Rating
Answer: attribute: rms power rating
value: None
source: None