EarFun EarFun K4 Kids Bluetooth Headphones, Wireless Review
The EarFun K4 packs premium features like ANC and Bluetooth 5.4 into a $21 kid-proof package. Its best trick? A battery that just won't quit.
The 30-Second Version
The EarFun K4 is a feature-packed kids' headphone that's tough, safe, and has a battery that seems to last forever. It scores an 86.3/100 overall, with a best-in-class 100th percentile battery score. At $21, it's an easy recommendation for any parent.
Overview
The EarFun K4 is a kids' headphone that gets the basics right and adds some serious battery life. It's built to be tough, comfortable, and, most importantly, safe for young ears with its volume-limiting tech.
You're getting a feature set here that punches way above its $21 price tag. Bluetooth 5.4, active noise cancellation, and those fun LED lights make it feel like a premium toy, not just a basic accessory. It's clear EarFun designed this to survive the backpack and the playground.
Performance
Let's talk battery, because it's insane. A 90-hour rating puts it in the 100th percentile in our database—no other kid's headphone comes close. The ANC works well for the price, landing in the 88th percentile, which is great for drowning out background noise during car rides or homework time. Sound quality is solid for the category, though the mic performance for calls is its weakest point at 67.4/100. It gets the job done, but don't expect studio-quality clarity from your six-year-old.
Pros & Cons
Pros
- The 90-hour battery life is practically unbeatable. 98th
- Build quality and comfort scores are both in the 98th percentile. 94th
- Volume-limiting tech and kid-safe materials give real peace of mind. 92th
- Bluetooth 5.4 provides a stable, wide-compatibility connection. 89th
Cons
- Microphone quality is the clear weak spot for voice calls.
- The ear cups can get a bit warm during long sessions.
- Some parents feel the default volume limit could be lower.
- The LED lights, while fun, cut the battery down to about 24 hours.
The Word on the Street
Specifications
Full Specifications
Design
| Form Factor | Over-Ear |
| Weight | 0.2 kg / 0.5 lbs |
| Ear Cushion | Leather |
Audio
| Driver Type | Dynamic |
| Freq Max | 20000 |
| Impedance | 32 |
| Sensitivity | 100 |
| Codecs | Volume Limited for Kids, LED Lights, Long Battery Life, Bluetooth 5.4 |
Noise Control
| ANC | Yes |
Connectivity
| Wireless | Yes |
| Bluetooth | 5.4 |
| Wired Connector | Bluetooth |
Battery
| Battery Life | 90 |
| Charge Time | 0.17 |
| Charging | USB-C |
Microphone
| Microphone | Yes |
| NC Mic | Yes |
Features
| Volume Limiting | Yes |
| Water Resistance | Water-Resistant |
Value & Pricing
At $21, this is an absolute steal. You're getting adult-headphone features like ANC and marathon battery life in a kid-proof package. Compared to other options in the $20-$30 range, the K4 offers more tech and better build quality. It's one of those rare products where you feel like you're getting more than you paid for.
vs Competition
Stacked against the iClever BTH12, the K4 wins on battery life and adds ANC, though the iClever might be a bit more colorful. Compared to more expensive 'adult' headphones like the Sony WH-1000XM6, you're obviously trading supreme sound and ANC for kid-safe durability and a price tag that's about one-tenth the cost. For the specific job of being a kid's first headphone, the K4 is arguably the smarter buy than splurging on a premium pair they might break.
| Spec | EarFun EarFun K4 Kids Bluetooth Headphones, Wireless | Sony Sony WH-1000XM6 Noise-Canceling Wireless Over-Ear | Apple AirPods Max Apple AirPods Max Wireless Over-Ear Closed-Back | Sennheiser Sennheiser ACCENTUM Plus Wireless Active | JBL JBL Tune 770NC Noise-Cancelling Over-Ear | Bang & Olufsen Bang & Olufsen Beoplay HX Noise-Canceling Wireless |
|---|---|---|---|---|---|---|
| Form Factor | Over-Ear | Over-Ear | Over-Ear | Over-Ear | Over-Ear | Over-Ear |
| Driver Type | Dynamic | Dynamic | Dynamic | Dynamic | Dynamic | Dynamic |
| Driver Size (mm) | — | 30 | 40 | 37 | 40 | 40 |
| Impedance Ohms | 32 | 48 | 16 | — | 32 | 24 |
| Wireless | true | true | true | true | true | true |
| Active Noise Cancellation | true | true | true | true | true | true |
| Open Closed Back | — | Closed | Closed | Closed | Closed | Closed |
| Bluetooth Version | 5.4 | 5.3 | 5.0 | 5.2 | 5.3 | 5.1 |
| Battery Life Hours | 90 | 30 | 20 | 50 | 70 | 35 |
Common Questions
Q: Is the volume limit safe and effective?
Yes, it uses a 74/85/94dBA multi-level limiter and is certified to CPC and Rohs2.0 safety standards. Some parents use additional software limiters on their devices for extra caution.
Q: How long does the battery really last with the lights on?
With the LED lights activated, you can expect about 24 hours of playtime from a full charge, which is still very good. With lights off, it jumps to an incredible 90 hours.
Q: Can it be used wired if the battery dies?
Yes, it includes a 3.5mm audio cable for a wired connection, so the music doesn't have to stop even if the battery is dead.
Who Should Skip This
Skip these if crystal-clear microphone quality for video calls is your top priority. Its mic scores in the 67th percentile, which is fine for a quick chat with grandma but not for serious online learning or gaming comms. Also, if your child has a very large head or is a teenager, the fit might be too small and childish.
Verdict
Buy this if you need a durable, long-lasting wireless headphone for a child aged roughly 4-10. It's perfect for school, travel, or just quiet time at home. The safety features and insane battery life make it a no-brainer for parents.