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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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4.7 ★★★★★
Based on 890 reviews
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M
Verified Purchase
M Girven
Boise, US
★★★★★ 3
Item was returned
Color: Blue
Used it one day and partially the following day. Put on charger. Never worked again. My dog played with it but returned it as defective.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 12, 2026
L
Verified Purchase
L
Houston, US
★★★★★ 4
Not for super chewers
Color: Blue
This ball seems to be of good quality; has held a charge well and is easy to use. Sadly, the cover lasted less than 15 minutes with our dog.... not for aggressive chewers for sure. Pretty funny to watch the hound dog jowls shake though.
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Reviewed in the United States on January 25, 2026
J
Verified Purchase
Jessica S.
Whiting, US
★★★★★ 5
Great fun for dogs!
Color: Orange
Two of our dogs really love this! It caused a lot of barking and chasing and running around trying to grab it. It's really funny to use the remote to control it (and especially make it stop when things get a little too chaotic!) It feels durable even when pawed and bumped into and stepped on. The battery life seems good. I plugged it in overnight to charge so not sure how long it took to charge, but it has lasted quite a while with the dogs playing with it and still doesn't need a charge. It's easy to screw off one side of the ball to plug it in to charge. The size is a little bigger than a tennis ball I would say and has a soft texture.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 6, 2026
K
Verified Purchase
Kathy Stefanski
Alexandria, US
★★★★★ 1
It doesn't work.
Color: Blue
The two halves of the ball shell come apart again and again when the dog plays with them. When it is time to recharge the core, it will not take a charge. The dog loves it, but it's unsafe to play with.
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Reviewed in the United States on January 15, 2026
M
Verified Purchase
Mary Roberts
Massapequa, US
★★★★★ 2
It doesn’t do what is supposed to do
Color: Blue
Wasn’t impressed..,all the ball does is vibrate. It doesn’t really bounce
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Reviewed in the United States on March 6, 2026

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