Radians 230-EHP Slim Electronic Earmuff - Radians 230-EHP is a low-profile electronic sound amplification earmuff. Dual independent microphones pick up and amplify low sound level noises, electronic circuitry protects from dangerous impulse noises of the shooting sports. Slim Cup for Gun Stock Clearance Cuts Sounds over 85 dB Dual Microphones Single On/Off Amplification Knob Compact Folding Headband