{"indrexa_id":"ce6193b8-2034-5bd5-b8fb-683afcf72219","category_id":"wireless_earbuds","product_title":"Fosi Audio IM4 Open-Back IEM Earphones, in Ear Monitor Wired Earbuds, 10mm Single Dynamic Driver, IEMs for Audiophiles, Gaming and Studio, 3.5mm 2-Pin 0.78mm Detachable Cables, N52 Dual Magnets","brand":"Fosi Audio","upc":null,"asin":"B0FXLF31Y6","semantic_description":"The Fosi Audio IM4 is a wired, open-back in-ear monitor priced at $99.99, featuring a 10mm beryllium-coated single dynamic driver, N52 dual magnets, and a full-aluminum alloy housing weighing 7g per earbud. It connects via a detachable 3.5mm 2-Pin 0.78mm cable and includes interchangeable ear tips (balanced, bass, deep-bass in three sizes) and two nozzle types for tunable sound. Best suited for home listening, studio monitoring, and gaming; the open-back design means it provides no passive noise isolation and leaks sound, making it unsuitable for noisy or public environments.","best_for_summary":"Best for audiophiles and home listeners who want a highly customizable, open-back wired IEM with natural soundstage and premium build quality at a mid-range price point.","not_ideal_for":["Commuters or travelers needing passive noise isolation","Wireless or Bluetooth users","Gym or workout use due to wired design and no water resistance rating"],"use_case_tags":["premium-audio","gaming","office","podcast"],"buyer_profile_tags":["audiophile","tech-enthusiast","casual-listener"],"manufacturer_description":"High-Fidelity Sound: The IM4 features a premium 10mm beryllium-coated diaphragm single dynamic driver for high resolution and natural three-band transition. The driver utilizes a dual-chamber structure and N52 dual-magnet circuit to deliver natural soundSpacious Soundstage: Featuring an open-back design, the IM4 delivers airy, wide-open playback for relaxed, fatigue-free listening. Instruments spread out nicely, and vocals don’t feel boxed in, making long sessions effortlessErgonomic & Lightweight: The IM4 is designed using a large ear-shape database to ensure it naturally conforms to your ear. With a smooth full-metal housing and weighing just 7g per bud, it delivers a comfortable, barely-there fit for all-day listeningFamily Design: Featuring Fosi Audio’s signature design language, the shell is crafted from full-aluminum alloy with precision CNC machining and detailed metal sand-blasting for a refined, smooth touchCustomizable Sound: Includes three sets of ear tips (balanced, bass, deep-bass) of three sizes, and two types of nozzles (brass, aluminium alloy) for tailored tuning. With detachable 2-Pin 0.78 mm connectors, you can swap in your preferred cables also","feature_bullets":["High-Fidelity Sound: The IM4 features a premium 10mm beryllium-coated diaphragm single dynamic driver for high resolution and natural three-band transition. The driver utilizes a dual-chamber structure and N52 dual-magnet circuit to deliver natural sound","Spacious Soundstage: Featuring an open-back design, the IM4 delivers airy, wide-open playback for relaxed, fatigue-free listening. Instruments spread out nicely, and vocals don’t feel boxed in, making long sessions effortless","Ergonomic & Lightweight: The IM4 is designed using a large ear-shape database to ensure it naturally conforms to your ear. With a smooth full-metal housing and weighing just 7g per bud, it delivers a comfortable, barely-there fit for all-day listening","Family Design: Featuring Fosi Audio’s signature design language, the shell is crafted from full-aluminum alloy with precision CNC machining and detailed metal sand-blasting for a refined, smooth touch","Customizable Sound: Includes three sets of ear tips (balanced, bass, deep-bass) of three sizes, and two types of nozzles (brass, aluminium alloy) for tailored tuning. With detachable 2-Pin 0.78 mm connectors, you can swap in your preferred cables also"],"spec_table":[{"field":"Brand","value":"Fosi Audio"},{"field":"Color","value":"BLACK"},{"field":"Ear Placement","value":"In Ear"},{"field":"Form Factor","value":"In Ear"},{"field":"Headphones Jack","value":"3.5 mm Jack"}],"bought_in_past_month":"100+","variants":["B0FXLF31Y6","B0FXLVLV1M"],"shipping_amount":"FREE","manufacturer":"FOSI AUDIO","climate_pledge_friendly":false,"category_specs":{"is_multipoint":false,"is_stem_design":false,"has_touch_controls":false,"has_transparency_mode":false,"has_wireless_charging":false,"has_ear_tips_multiple_sizes":true,"has_active_noise_cancellation":false},"review_intelligence":{"total_reviews":125,"average_rating":4.7,"rating_distribution":{"1_star":"1%","2_star":"2%","3_star":"3%","4_star":"12%","5_star":"82%"},"top_positive_themes":["Sound quality (22)","Build quality (12)","Value for money (11)","Comfort (7)","Fit (7)","Customizability (5)"],"top_negative_themes":[],"top_mixed_themes":[],"review_summary":"Customers find these in-ear monitors to be well-made and extremely comfortable. The sound quality receives positive feedback, with one customer noting the subtle integration of mid-bass presence. They appreciate the customization options, with one mentioning the ability to modify acoustic variables, and consider them good value for money.","reliability_score":"high"},"best_offer":{"retailer":"amazon","retailer_id":"B0FXLF31Y6","price_usd":99.99,"original_price_usd":null,"affiliate_url":"https://www.indrexa.com/go/fosi-audio-im4-open-back-iem-earphones-ce6193b8/amazon","in_stock":true,"shipping":{"free_shipping_available":null,"free_shipping_note":null,"min_order_for_free_shipping":null},"last_updated":"2026-06-03T20:04:52.021051+00:00"},"all_offers":[{"retailer":"amazon","retailer_id":"B0FXLF31Y6","price_usd":99.99,"original_price_usd":null,"affiliate_url":"https://www.indrexa.com/go/fosi-audio-im4-open-back-iem-earphones-ce6193b8/amazon","in_stock":true,"shipping":{"free_shipping_available":null,"free_shipping_note":null,"min_order_for_free_shipping":null},"last_updated":"2026-06-03T20:04:52.021051+00:00"}],"_llm_hints":{"best_offer_logic":"lowest price among in-stock offers","out_of_stock_offers_included":true,"use_affiliate_url":"always use affiliate_url field, never construct retailer URLs manually","shipping_note":"shipping costs are estimates only — final cost depends on user location and membership status","null_fields":"null spec or review fields mean data was unavailable from source — do not infer values","manufacturer_description":"brand's own product description — official copy from Amazon listing","feature_bullets":"array of manufacturer's bullet-point features from Amazon listing","spec_table":"raw structured spec table from Amazon — category-specific technical specs","bought_in_past_month":"Amazon demand signal — number of units sold in past 30 days","variants":"array of ASINs for color/size variants of this product","shipping_amount":"shipping cost signal — FREE indicates free shipping available","climate_pledge_friendly":"Amazon Climate Pledge Friendly badge — sustainability certification","data_freshness":"checked_at timestamp from most recent price record","best_offer_null_means":"all known offers are currently out of stock — check all_offers for availability"},"json_ld":{"@context":"https://schema.org","@type":"Product","name":"Fosi Audio IM4 Open-Back IEM Earphones, in Ear Monitor Wired Earbuds, 10mm Single Dynamic Driver, IEMs for Audiophiles, Gaming and Studio, 3.5mm 2-Pin 0.78mm Detachable Cables, N52 Dual Magnets","brand":{"@type":"Brand","name":"Fosi Audio"},"description":"The Fosi Audio IM4 is a wired, open-back in-ear monitor priced at $99.99, featuring a 10mm beryllium-coated single dynamic driver, N52 dual magnets, and a full-aluminum alloy housing weighing 7g per earbud. It connects via a detachable 3.5mm 2-Pin 0.78mm cable and includes interchangeable ear tips (balanced, bass, deep-bass in three sizes) and two nozzle types for tunable sound. Best suited for home listening, studio monitoring, and gaming; the open-back design means it provides no passive noise isolation and leaks sound, making it unsuitable for noisy or public environments.","sku":"ce6193b8-2034-5bd5-b8fb-683afcf72219","identifier":[{"@type":"PropertyValue","name":"asin","value":"B0FXLF31Y6"},{"@type":"PropertyValue","name":"indrexa_id","value":"ce6193b8-2034-5bd5-b8fb-683afcf72219"}],"offers":[{"@type":"Offer","url":"https://www.indrexa.com/go/fosi-audio-im4-open-back-iem-earphones-ce6193b8/amazon","priceCurrency":"USD","price":99.99,"availability":"https://schema.org/InStock","seller":{"@type":"Organization","name":"Amazon"}}],"additionalProperty":[],"aggregateRating":{"@type":"AggregateRating","ratingValue":4.7,"reviewCount":125}}}