Features: Electronic Noise Blocking Earmuff Earmuffs circuit boards respond to noise for 300 milliseconds. Sound pickup device will be automatically turn off pickup if the around noise higher than 85DB. Amplification 6 times to detect the ambient sounds if lower than 70dB High fidelity stereo sound Adjustable headband, light weight,soft padded ear cushion Foldable headband, easy for storage Independent electronic circuit on both cups Idea for Shooting,Military,hunter and worker involved in noisy surrounding Function introduction: 1.Both sides of the switch independent control of both sides of the pickup. 2. Before turning on the switch,that simple sound-proof earmuffs. 3.Open the switch,Sound pickup device can be stored around the ambient sound down,high sensitivity can capture and amplify the slight sounds(from animals),and you can response quickly. 4.When the surrounding sound suddenly a loud noise (such as gun color and explosions) earphone will automatically turn off the pickup or reduce the volume of play, play a role in protecting the hearing. Color: Black/Green Material of headband: POM Plastic Material of ear cushion: with foam inside Material of cup: ABS Dimension of earmuff(folding): 23 x 14cm/9.06" x 5.51" Battery type: Two AAA batteries each side (Battery not included,working hours more than 200 hours, Quantity: 1PC Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1PC x Ear Muffs (Battery not included)