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Etymotic ER4-SR Studio Reference In-Ear Isolating Earphone with Replaceable Cable - Black

Marsoni M251S
Sale price$8870.71
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Etymotic ER4-SR Studio Reference In-Ear Isolating Earphone with Replaceable Cable - BlackBrand Etymotic Research Colour Black Ear placement In Ear Form factor In Ear Impedance 45 Ohm Noise control Sound Isolation Sensitivity 45 Ohm Headphone jack Detachable Connector Model name ER4SR Connectivity technology Wired About this item Enhanced accuracy with greater sound output and flat response ACCU Driver balanced armature, precision matched, custom tuned drivers Braid reinforced cable for enhanced durability and low microphonic effect ACCU
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.3 ★★★★★
Based on 1876 reviews
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LUDIVINA AYALA
Houston, US
★★★★★ 5
Keep my dog busy.
Color: Remote blue
The duraspin dog ball bounces, moves, and vibrates automatically. My Labrador chased it all afternoon and never got tired of it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 10, 2025
A
Verified Purchase
Amazon Customer
Charlottesville, US
★★★★★ 5
Durable
Color: Green
My dog absolutely loves this. Its helped us get her back into going into her crate well again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
K
Verified Purchase
Karla Allen
Chelsea, US
★★★★★ 5
Aggressive chewer
Color: Green
Very durable and long lasting dog toy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 5, 2026
M
Verified Purchase
Marcy
Los Angeles, US
★★★★★ 5
AMAZING!
Color: Pink Blue
I have never written a review before, and I shop 4-5 days a week on Amazon. My 5 month old puppy LOVES these chew toys. When I first opened the box I was worried because they were so hard, but Poppy went crazy. He chews on them, tosses them and retrieves them, runs in circles around them and barks, and when he finally settles down will chew them and make these pig snort sounds of contentment. I have bought a lot of toys for my new puppy… But these are the best by far!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 13, 2026
B
Verified Purchase
Bronze
Lake Worth, US
★★★★★ 4
Toy broke in two
Color: Blue
This is a great toy for aggressive chewers. My reason for 3 stars is my dog dropped it on the tile floor the second day she had it and it broke in two. Not real happy with that. Update: The seller has been proactive and accepting of the very minor issue of the toy breaking. Responded within 24 hours and issued a refund. Because of their response I am changing my review to 4 stars.
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Reviewed in the United States on June 23, 2025

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