Features :
Dimensions at mm : h = 170 mm x w = 153 mm x d = 98 mm
Operates on 2 AAA LR03 batteries (not included)
HOW DO THE HEADPHONES WORK?
A thumbwheel for turning the headphones on and off, and for adjusting the amplification volume to suit your practice and environment.
DIRECTIONS FOR USE :
Depending on what I do (shooting, hunting, ....) and where I am (shooting range, plain, forest, etc.), I adapt the amplification volume.
You need to hear your surroundings, but there's no point in "over-amplifying".
If you're outdoors, be aware of the wind, which will create a blast effect in the microphones.
Don't use your headphones with the amplification system switched off, as it won't protect you effectively.