HuntGold Car Vehicle Inline FM Radio Aerial Antenna Signal Enhance Amplifier AMP Booster The amplifier circuit with voltage conversion design can be directly connected to 12v power supply, automotive import amplification components, reflect ultrasensitive, more stable Enhance Radio signal Reduce Noise Insurance Block: Waterproof Blade Fuse Holder Applies to: automotive and other FM signal reception, increase the reception distance, enhanced sensitivity of weak signals