Respectfully I didn't ask you for the rating, I asked you if they reduce noise without the battery installed. I asked you that for a reason. To try to help you. How well do they reduce noise without batteries installed? If they cant do that they don't work as muffs, powered or not.
A blender is supposed to be louder when you amplify it that's how amplification works. All the electronic muffs allow noise below a threshold through, louder noises are louder than quiet noises that's normal. The noise reduction ONLY works above whatever threshold the factory sets.
Please understand I'm not trying to argue with you here, just help you to have a realistic expectation of how these work.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”
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