If you want a discreet single earbud with up to 12 hours of continuous listening for swimming, choose SYSFUN Single; if you need two complete pairs and a charging case, choose QJF 2-Pack. My pick for swimming is SYSFUN, because its stated battery life is longer per charge, but neither product’s supplied specifications establish that it is waterproof or designed for swimming.
SYSFUN Single vs QJF 2-Pack at a Glance
• QJF 2-Pack’s biggest strength: Two independent pairs in two different styles, plus a charging case; its trade-off is that only one pair can be used at a time, and each charge lasts 4–5 hours.
• Best fit for extended listening from one earbud: SYSFUN Single, with a stated 12-hour battery life and a built-in microphone.
• Best fit for trying two sleep-oriented designs: QJF 2-Pack, which includes both low-profile and in-ear styles.
• Choose SYSFUN if you want one small earbud for spoken audio, calls, or discreet wear and do not need a case.
• Choose QJF if you value having a spare complete pair, a charging case, and the option to switch between two designs.
SYSFUN is a single Bluetooth earbud with a small in-ear design. The supplied information describes it as discreet when worn and says it is intended to sit snugly for activities such as walking, running, biking, working, and sleeping. It uses Bluetooth 4 and has a stated range of 10 meters. Those details make it a straightforward option for someone who wants one earbud connected to a phone or another Bluetooth device, rather than a two-ear setup.
Battery life is the clearest practical advantage: the stated average is 12 hours, with a charge time of 2.5 hours. That longer single-charge figure may suit someone listening to podcasts, audiobooks, or other spoken content over a long stretch. The product information specifically notes that spoken audio is a strong use, and the built-in microphone supports calls. Sound isolation is listed as its noise-control type, so this is not an active noise-cancelling model.
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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-18 · 7 min read · Independent comparison
It also comes with important limits. One earbud is included, and there is no charging case or wall adapter. A second SYSFUN earbud can be paired for stereo according to the product information, but that requires buying another unit and following the pairing steps. People with narrow ear canals may find prolonged wear uncomfortable, and the maker’s fit notes say it may not suit very small ear canals. Skip SYSFUN if you require two earbuds, a case, or confirmed protection for swimming.
The case adds a different kind of convenience from SYSFUN’s longer single-charge figure. QJF lists 4–5 hours of playback per charge and over 30 hours of total playback from the case. The case also has a battery display. Bluetooth 5.3 is stated in the product description, while product information lists Bluetooth version 6, so buyers should not assume one precise version from these differing details. The listed noise control is passive noise cancellation: the soft tips are described as forming a seal that can reduce ambient sound. That is not the same claim as active noise cancelling. So, if you are searching for active noise cancelling bluetooth earbuds for swimming, this product’s stated features do not establish either active cancellation or swimming protection.
The two pairs are not meant to work together as one stereo set. The instructions say to use one pair at a time; to switch styles, put the current pair back in the case and take out the other. The product is described as sweatproof for daily use and light workouts, but that does not establish suitability for swimming. Its stated battery life per charge is also shorter than SYSFUN’s. Skip QJF if you need both included pairs to play together, or if you need confirmed waterproofing for swimming.
Side-by-Side: Which Should You Choose?
• Best for longer listening between charges → SYSFUN Single. Its stated battery life is 12 hours, compared with QJF’s 4–5 hours per charge.
• Best for a case and more total playback → QJF 2-Pack. Its case is listed as providing over 30 hours of total playback and includes a battery display.
• Best for trying different sleep shapes → QJF 2-Pack. Its in-ear and flat styles give you two distinct designs to compare for comfort.
• Best for a backup pair → QJF 2-Pack. The second pair is a separate set, though only one pair can be used at a time.
• Best for calls and spoken audio in a single earbud → SYSFUN Single. Its description highlights spoken content and a built-in microphone for calls.
• Best for passive reduction of surrounding sound → QJF 2-Pack. Its soft tips are described as forming a seal, and passive noise cancellation is listed.
• Best-supported choice for swimming → Neither. The available product information does not give either model a swimming or waterproof rating. SYSFUN’s longer battery life alone does not make it suitable for use in water.
For swimming, the deciding issue is not the number of earbuds or battery runtime; it is whether the product is specified for use in water. Neither data sheet provides a waterproof rating or says that the earbuds are designed to be submerged or worn while swimming. I would not treat “sports,” “sweatproof,” or a snug fit as proof of water protection. Check the product’s current specifications carefully before using either model in or around a pool.
Fit deserves equal attention if you plan to wear earbuds in bed. SYSFUN’s small in-ear form may appeal if you prefer a discreet single bud, but the fit notes warn that narrow ear canals may become uncomfortable during extended wear. QJF offers two designs, which gives you a useful alternative, but the supplied information does not guarantee that either style will suit every ear. Descriptions such as side-sleeper-friendly are design claims, not a substitute for considering your own fit.
My Verdict
In my opinion, I would choose SYSFUN Single for a simple, discreet earbud with longer stated playback per charge and an emphasis on spoken audio.
For swimming, though, I would not use either based on the supplied information: neither has a stated waterproof rating.
I would choose QJF instead if my priority were a charging case, a spare pair, and two sleep-oriented styles to try.
The best fit comes down to runtime and simplicity versus the extra set and case.
SYSFUN lists an average battery life of 12 hours. QJF lists 4–5 hours per charge, with over 30 hours of total playback from its charging case.
The supplied information does not state that either product is waterproof or designed for swimming. QJF is described as sweatproof for daily use and light workouts, which is not the same as a swimming rating.
No. The two QJF pairs are independent and are intended to be used one pair at a time. The instructions say to return one pair to the case before switching to the other.
QJF offers two designs, including a flat style, so it gives you more than one fit to try for sleep or side sleeping. SYSFUN is described as small and discreet for sleeping, but its fit notes warn that prolonged wear may be uncomfortable for people with narrow ear canals.
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