We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 7 min read · Independent comparison
If you want to fix the way cheap TWS earbuds actually feel in your ears, choose Dekoni Audio Bulletz TWS Memory; if you need a tough little home for a set of JBL earbuds so they survive your bag, choose RLSOCO Carrying Case. These two products get compared a lot, but they solve completely different problems — one upgrades the listening end, the other upgrades the storage end.
• Dekoni Audio Bulletz TWS Memory — biggest strength: slow-rebound memory foam that seals the ear canal better than stock silicone, so cheap earbuds suddenly isolate noise and hold their bass.
• Dekoni Audio Bulletz TWS Memory — biggest trade-off: it's a wear item, not gear. Foam compresses, ages and eventually needs replacing, and Dekoni lists no warranty on it.
• RLSOCO Carrying Case — biggest strength: a hard EVA shell that shrugs off knocks, shock, dust and splashes, with a two-year warranty behind it.
• RLSOCO Carrying Case — biggest trade-off: it's a case only. Buy it and you still own nothing to listen with — no earbuds, no cable, no spare tips included.
• Who the Dekoni tips are for: anyone whose cheap TWS earbuds sound thin, fall out on runs, or ache after an hour.
• Who the RLSOCO case is for: anyone who already owns one of the JBL models it fits and keeps losing or scuffing the charging case.
This is a small, unglamorous product that changes how a budget pair of earbuds behaves. Dekoni builds these tips from slow-rebound memory foam with a universal 4.9mm bore, so they push onto a wide range of in-ear models — the brand lists Beats Powerbeats Pro, Jabra, Jaybird, Sennheiser Momentum and Sony WF-1000XM4 among compatible devices. The low-profile silhouette is deliberate: it's shaped so the tip doesn't foul the charging case on true wireless buds, which is the classic failure point when people try foam on TWS.
What it does best is seal. Silicone tips rely on a stiff rim pressing against your ear; foam expands gently to fill the shape of your canal instead, which cuts external bleed and reinforces bass response. That matters most on inexpensive earbuds, because their tuning usually leans thin and bright — a better seal is often the single cheapest way to make them sound fuller. The slow-rebound foam also spreads pressure instead of concentrating it, so long commutes, gym sessions and work-from-home days get less ear fatigue than stiff silicone allows.
Buy it if your earbuds slide out mid-workout, if you want more isolation without paying for active noise cancelling, or if you simply want to keep a working pair alive. Skip it if you're happy with how your stock tips fit — foam is a personal-fit product, and if silicone already seals well you won't gain much. Also skip it if you want a guaranteed lifespan: Dekoni states no warranty, and foam tips are consumables, washable with cold water and gentle soap but not immortal. Sizing runs Small at 10.5mm, Medium at 12.5mm and Large at 13.4mm, sold as a single pair or a three-pack. If you're unsure, the three-pack is the sane way to experiment rather than guessing one size.
The RLSOCO case is a hard-shell storage box for a specific family of JBL true wireless earbuds — Vibe Beam, Vibe Beam 2, Tune 230NC TWS, Vibe 200TWS, Tune 130NC, Tune Beam, Tune Beam 2 and Wave 200TWS. It's built from fiber and high-density EVA, water resistant, dust resistant and scratch resistant, with a shell stiff enough that it resists deforming in a bag. RLSOCO also says the fabric, lining and EVA compartments are certified to RoHS and SGS standards, and backs the case with a two-year warranty.
What it does best is absorb the stupid accidents. Earbud charging cases crack in backpacks, get crushed under laptops, and collect lint in pockets. A hard EVA shell with a dedicated compartment takes that abuse instead, and the compact footprint means it slips into a purse, backpack or handbag without eating space. At roughly 0.04 kg it adds almost nothing to what you're already carrying. The water-resistant and dust-resistant claims are the practical ones here — this is protection against rain, gym bags and general grime, not submersion.
Buy it if you own one of the listed JBL models, travel with your earbuds, or have already replaced a cracked charging case once. Skip it if your earbuds aren't on that compatibility list — this is a fitted case, not a universal pouch, and a mismatched charging case simply won't sit right. Also skip it if you were hoping for a bundle: it's case only, and no earbuds, cable or ear tips are included despite the listing mentioning cable and eartips compatibility. That's a genuinely confusing point in the product copy, so read it as "the case has room for those things," not "those things come with it."
• Best for making cheap TWS earbuds sound better → Dekoni Audio Bulletz TWS Memory. A tighter foam seal lifts bass and cuts outside noise more effectively than stock silicone.
• Best for keeping earbuds in your ears during workouts → Dekoni Audio Bulletz TWS Memory. The slow-rebound foam grips and resists slippage where stiff tips work loose.
• Best for long listening sessions → Dekoni Audio Bulletz TWS Memory. Memory foam distributes pressure instead of pressing on one spot.
• Best for protecting a charging case from knocks → RLSOCO Carrying Case. Hard EVA shell, shock and scratch resistance, compact enough for a pocket.
• Best for travel and commuting storage → RLSOCO Carrying Case. Dust and water resistance plus a two-year warranty covers the daily grind.
• Best for a set-and-forget purchase → RLSOCO Carrying Case. It's a durable object with a warranty; foam tips are consumables you'll rebuy.
• Best for JBL Vibe Beam, Tune 230NC, Vibe 200TWS and similar owners → RLSOCO Carrying Case. Those are the exact models it's molded for.
• Best for anyone whose earbuds don't fit → Dekoni Audio Bulletz TWS Memory. Three calibrated sizes and a universal 4.9mm bore cover far more models than a fitted case does.
If I had to pick one, I'd buy the Dekoni Audio Bulletz TWS Memory. The reason is simple: fit and seal are the two things cheap TWS earbuds get wrong most often, and no case in the world fixes a thin, leaky sound or an earbud that won't stay put. Foam tips address the actual listening experience, and the three-pack option lets you dial in size without much risk. The RLSOCO case is a genuinely well-made accessory — hard EVA, water and dust resistance, a two-year warranty — but it protects rather than improves. If you already own a compatible JBL pair and treat your bag like a tumble dryer, buy the case. If your earbuds are the problem, buy the tips.
what is tws earbuds
TWS stands for "true wireless stereo" — earbuds with no wire between the left and right bud, each connecting independently over Bluetooth. Both products here are built around TWS earbuds: the Dekoni tips are shaped to sit low enough not to block a charging case, and the RLSOCO case is molded for specific JBL TWS models.
what is tws earbuds means
It means the two earbuds talk to each other and your phone without a cable, and each one carries its own battery. That's why charging cases matter so much, and why a case that takes knocks — like the RLSOCO hard shell — is worth considering if you carry your earbuds everywhere.
how much is tws earbuds
That varies enormously by brand, model and whether you're buying buds alone or with extras. This page doesn't list prices; check the current price on Amazon using the button on this page for each item.
how to tws earbuds
Pairing is usually the same routine: take both buds out of the case, put them in your ears, and let them enter pairing mode, then select them in your phone's Bluetooth settings. If they won't seal or keep falling out, that's a tip problem rather than a pairing problem — which is exactly the situation the Dekoni memory foam tips are designed for.
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See also: Dekoni Audio Bulletz TWS Memory vs AMAFACE Kids: TWS Earbuds, EARLA TEC Replacement Audio Cable vs L LTGEM Headphones Case Bag, Audio-Technica ATH-M40x vs OneOdio Pro10