These Swedish made hearing protectors are without a doubt the finest electronic muffs we have ever used. They are extremely comfortable, simple to operate, and produce a far superior sound quality. Components and materials are like those used in flight or military gear - tough composite plastic shells, high quality leather covered head band, moisture sealed screw on battery access port and liquid foam filled ear surrounds. The muffs operate on two AAA alkaline batteries (included) with a stated battery life of around 200 hours and automatic battery save function. Electronics are all digital, and the microphones on each side are moisture protected and do not stick out from the muff profile. Easy three button control for on-off, higher or lower volume. Automatically switches off after four hours to save battery power. These muffs have a very low profile design, so they should not interfere with rifle stocks. There is also an auxiliary input port and a supplied cord for connecting an external audio source. If you enjoy using high quality equipment, or have not been completely happy with other electronic hearing protectors you have tried, we highly recommend this MSA unit. The noise reduction rating (NRR) is 18 Db .
Sinclair, Issue:3B, Page:230
SPECS: Batteries: 2 x 1.5 V AAA/LR6, estimated operating time is around 200 hours Weight: 310 g / 10.9 oz (headband); 280 g / 9.9 oz (neckband) - excluding batteries.