Pro Ears - Stalker Gold - Electronic Hearing Protection and Amplification Earmuffs - NRR 25 - Typhon Military grade Dual circuit boards, Gold connectors for high quality audiophile sound, Automatic shut off and amplifies sound more than 8x Normal hearing Padded, adjustable headband, Pro form leather Ultra comfortable ears seals 1.5 milli-second attack time Includes 4 n size batteries and weighs only 9.3 ounces, Battery life is 250 hours Has 3.5mm Input jacks for i-pod and MP3 players