The BTH21 is for kids who want headphones that look fun, with light-up cat ears and cute ear-cup prints, while parents get two switchable volume limits of 85 dB and 74 dB. It connects over Bluetooth 5.3 and iClever quotes up to 60 hours with the lights off, or 20 hours with them on. A 10-minute charge gives over 7 hours. The included 3.5 mm cable lets it work wired too, and the built-in mic handles online lessons and calls. It folds for the school bag, and a sticker sheet comes in the box.
Key features
Two switchable volume limits
The headphones default to an 85 dB limit. Press the + and - buttons together to switch to 74 dB, and a voice prompt confirms the change. iClever says its Sound Refiner tuning also reduces the 2–4 kHz range.
Light-up cat ears
The cat ears glow with RGB lights in three modes: slow flash by default, quick flash and steady light, and a further press turns them off. Keeping the lights off gives much longer playtime.
Long battery with quick top-up
The 500mAh battery lasts up to 60 hours with the lights off and 20 hours with them on, according to iClever. A full charge takes about 2 hours over USB-C, and 10 minutes gives over 7 hours of listening.
Wired or wireless, with mic
Use Bluetooth, or plug in the included 3.5 mm cable for tablets, laptops and in-flight screens with a 3.5 mm socket. The built-in microphone works for online lessons and calls, and the ear cups swivel 110° and fold flat.
Specifications
| Form factor | On-ear, foldable, adjustable headband, 110° swivel ear cups |
|---|---|
| Bluetooth | Bluetooth 5.3 (2.402–2.48 GHz) |
| Volume limit | 85 dB (default) / 74 dB, switchable |
| Driver | 40 mm |
| Frequency response | 20 Hz – 20 kHz |
| Microphone | Built-in |
| Lighting | RGB cat ears: slow flash, quick flash, steady, off |
| Battery | 500mAh lithium polymer (3.7 V) |
| Battery life | Up to 60 h (lights off) / 20 h (lights on) |
| Charging | USB-C, 5 V 1 A, about 2 h; 10 min gives 7+ h |
| Wired mode | 3.5 mm audio jack, cable included |
| Materials | Leather ear pads, ABS; BPA-free |
| Weight | 159 g |
In the box: BTH21 wireless headphones, USB-C charging cable, 3.5 mm audio cable, sticker, user manual
Who it's for
- Kids who like colourful, light-up headphones
- Parents who want a switchable 85/74 dB volume limit
- Online lessons, tablet videos and flights, wired or wireless
Not ideal for: Not the pick if you need noise cancelling for flights or noisy commutes, or prefer a plain, low-key look.
Warranty and delivery
This is Hong Kong licensed stock, covered by the local distributor's warranty; the period is shown on the warranty card in the box. Brand new. Stock can be viewed at our Kwun Tong showroom by appointment.
Delivery by SF Express, freight collect. Free self-collection at our Kwun Tong shop (11:00–19:00). For other arrangements, please WhatsApp us.
FAQ
How do I switch between the 85 dB and 74 dB limits?
Briefly press the + and - buttons at the same time. The headphones switch limit and announce the new level; 85 dB is the default.
Can my child use it when the battery runs out?
Yes. Plug in the included 3.5 mm audio cable to use it wired with a device that has a 3.5 mm socket.
Is a charger included?
A USB-C charging cable is included but not a power adapter. The manual asks for a 5 V adapter.