Are these just eat muffs or actual Noise cancellation? What batteries do they take? What frequency range do they cancel?

Dear Valued Customer, They are noise cancelling ear muffs with adjustable headbands, Designed for a tight fit to keep your ears and hearing safe and without strain. If you experience other issues, please contact us by clicking the link below. https://www.amazon.com/gp/help/contact-seller/contact-seller.html?marketplaceID=ATVPDKIKX0DER&sellerID=A3US6EPPMUS293&ref_=v_sp_contact_seller Onhear Team

How is this for blocking out conversations in an office?

I've never used them in that setting but it would probably reduce the noise but not completely get rid of it. I put them on and turned the TV up real loud and it reduced the noise but I still heard the tv.

what is real weight? top of page says 7.65oz but grid says 8.6?

I don't know I know is tight,I take it off every I can at work.

What is the tested NRR level?

If you read the product information section of this item it gives the answer you seek. Knowledge about NRR and SNR ratings: SNR rating = 36dB SNR (single number rating) is the system for the European Union NRR rating = 29dB NRR (noise reduction rating) is the system for USA/ANSI standards NRR 29dB/ SNR 36dB Hearing Protection Our hearing protection earmuffs are made with noise-dampening sponge material, offering a 29dB Noise Reduction Rating to protect your ears from noise damages.

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Item Weight	7.7 ounces
Product Dimensions	3.03 x 6.1 x 7.09 inches
Item model number	SA-8-11
Size	Universal
Color	Dark Black
Style	Modern
Material	Foam, Leather
Pattern	Solid
Special Features	Adjustable headband
Batteries Included?	No
Batteries Required?	No

OnhearEar Protection Headphones for Adults Kids, Noise Cancelling Headphones for Autism, Adjustable Noise Cancelling Ear Muffs, Earmuffs Hearing Protection, Effective Ear Muffs for Noise Reduction

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