The Supreme Pro is the top-level model available from world leader MSA-SORDIN. It features include: Provides optimum protection with high amplification, AUX input and watertight battery compartment. Both earmuffs are shaped to suit both right-handed and left-handed shooters (for comfortable rifle mounting). Two separate, well-shielded microphones for optimum stereo effect and location of sound direction. Rugged "military spec" construction: One piece molded cups, steel pins connecting the head band, glass fiber reinforced polymer head band and water proof one-piece switch rubber control panel. High amplification and natural sound reproduction without chopping. Around 600 hours battery life with two standard AAA batteries. Power saving auto shut-off feature after 4 hours of no button input. AUX input for connecting external audio sources, such as an MP3 payer, hunting radios or dog tracker. Lead with 3.5 mm mono jack plug included. A comfortable, luxurious leather lining covers the head band. Gel Pads sold separately Weight: 310 g SNR = 25 dB