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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-22 · 6 min read · Independent comparison
If you want a beginner keyboard you can actually play music on right away, choose RockJam RJ490; if you need a hard shell to protect a pair of over-ear headphones you already own, choose stukcaze Hard Headphone Case.
• RockJam RJ490's biggest strength: a real 49-key playing surface with built-in speakers, a 3.5mm headphone jack, and the flexibility of USB-C or battery power — a complete starter instrument.
• RockJam RJ490's biggest trade-off: it's an entry-level keyboard, not a serious piano. Compact keys and beginner-focused tones mean it won't satisfy an advancing player.
• stukcaze Hard Headphone Case's biggest strength: hard EVA plus PU double protection that's described as waterproof and shockproof, with a dedicated spot for a charger.
• stukcaze Hard Headphone Case's biggest trade-off: it only fits Sony WH-CH720N and Soundcore by Anker Q20i headphones, and the headphones themselves are not included.
• Pick the RockJam RJ490 if you or a teenager in the house wants to start learning keys on a budget-friendly, travel-friendly instrument.
• Pick the stukcaze case if you already own one of those two specific headphones and want to stop tossing them loose into a backpack.
The RJ490 is a 49-key mini keyboard piano aimed squarely at beginners. That's not a knock — it's the whole point of the design. Forty-nine keys is enough to play real melodies and simple two-handed pieces, but short enough that the keyboard stays compact. The dimensions back that up: roughly 30.7 inches wide, 7.3 inches deep and just over 2 inches thick, at about 2 kg. That's a board you can slide onto a desk, a bed, or into the back seat of a car without rearranging your life.
What makes it genuinely useful for a new player is the combination of built-in speakers and a 3.5mm headphone jack. Practice out loud when the house is empty, plug in headphones when it isn't. That single feature is often the difference between a beginner actually practicing and a beginner quietly giving up because everyone complained. Power is equally flexible: run it from USB-C (cable not included, so factor that in) or from batteries if you want to play somewhere without an outlet. RockJam also bundles piano note stickers and access to Simply Piano and TakeLessons content, which suggests the company expects buyers to be genuinely new to music rather than returning players.
Who should buy it: teens and adults who want a first keyboard, parents buying for a kid who's shown interest, and anyone who wants something light enough to move between rooms or take on trips. The mint green polished finish is a nice touch if you don't want another black slab in the corner.
Who should skip it: anyone past the beginner stage. The specs describe a compact, lightweight instrument with built-in tones and rhythms — that's a learning tool, not a gigging or serious-practice piano. If you need weighted keys or a full 88-key range, this isn't it.
This one is much narrower, and the listing is refreshingly honest about it. The stukcaze hard case is built for the Sony WH-CH720N and the Soundcore by Anker Q20i — and that's the list. Before ordering, check that your headphones are one of those two models, because a hard case that doesn't fit is worse than no case at all.
Assuming they are, the design makes sense. The shell is hard EVA wrapped in PU, which the listing describes as providing double protection and being both waterproof and shockproof. The interior is soft, so it cradles the headphones instead of scratching them. There's a dedicated storage position for a charger, which solves a small but real annoyance: the cable that always goes missing when you actually need it. A smooth, sturdy zipper with a wide opening means you're not fighting the case every time you pack up.
At 120 grams it adds almost nothing to a bag, and the handle strap makes it easy to carry on its own. This is a travel-and-storage product, full stop. The listing is explicit that only the case is included — the headphones are not — so don't order this expecting to unbox a pair of Sonys.
Who should buy it: anyone who owns either compatible headphone model and regularly commutes, flies, or studies in shared spaces. If your headphones currently live loose at the bottom of a backpack next to keys and a water bottle, this is the fix.
Who should skip it: anyone with different headphones, and anyone expecting a case to improve sound. It protects; it doesn't perform. The pink color is the only finish described, so if you want something understated, that's a consideration.
• You want to make music → RockJam RJ490. It's an instrument; the case is not.
• You already own Sony WH-CH720N or Soundcore Q20i headphones → stukcaze case. It's purpose-built for exactly those two.
• Quiet practice without disturbing anyone → RockJam RJ490, thanks to the 3.5mm headphone jack and built-in speakers.
• Protection while travelling → stukcaze case, with its hard EVA shell, PU cover and shockproof, waterproof description.
• You need to power it two different ways → RockJam RJ490 (USB-C or batteries).
• You want something that barely weighs anything → stukcaze case at 120 g, versus the keyboard at around 2 kg.
• You're buying for a kid starting lessons → RockJam RJ490, which includes note stickers and app-based lesson content.
• You want a single grab-and-go item with a handle → stukcaze case, which has a carry strap built in.
These aren't competitors, so the honest answer is that most readers should buy at most one of them. If I had to hand a single recommendation to a typical shopper searching this comparison, I'd lean toward the RockJam RJ490, because it's the more broadly useful purchase — it does something (makes sound, teaches someone to play) rather than protecting something you already have. That said, if you already own the Sony WH-CH720N or the Soundcore Q20i, the stukcaze case is the smarter, more focused buy, and I'd pick it without hesitation for travel. Check the current price on Amazon for whichever one matches your situation, and confirm your headphone model before ordering the case.
FAQ
how to use external headphones on mac
how to connect mobile headphones
Most mobile headphones pair over Bluetooth or plug into your phone's port or headphone jack. The stukcaze case doesn't connect anything — it only stores and protects the Sony WH-CH720N or Soundcore Q20i when you're not using them.
how to connect c port headphones
USB-C headphones plug directly into a USB-C port and are usually recognised automatically. Keep in mind the RockJam RJ490 uses USB-C for power only (cable not included), not for audio input, so you can't play sound into it that way.
how to pack headphones
Fold the earcups flat, place the headphones into the soft interior of a hard case, and use the dedicated charger slot for your cable. The stukcaze case is built exactly for this routine with its Sony WH-CH720N and Soundcore Q20i compatibility.
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See also: JLab Cloud Foam Earbud vs ANKHOH Hard Headphone Case, Xmenha BT048S vs Perfcaze Hard Headphone Case, WERJIA Hard Carrying Case vs ZUJFPL EVA Hard Case