If you already like the X9 piston line and are stuck between generations, use this split:
- Want higher listed stroke speed, intelligent heating, and (on some manufacturer pages) voice / stepless control → start with X9 IV (4th Gen).
- Want a lighter listed unit, a 120° suction cup for hands-free setups, and a lower list price on this storefront → start with X9 III (3rd Gen).
This guide compares the two SKUs listed on hicnshop. Specs can differ by region or packaging revision—re-check the live product page before you order. It is product education for adult shoppers only. It is not medical advice and does not claim health or treatment outcomes.
Quick links
- X9 3rd Gen
- X9 4th Gen
- A380 vs X9 (different line)
- Beginner piston guide
- How to clean a LETEN masturbator
- Star products
- Electric masturbators
One-line verdict
Choose IV for listed speed + heating (and voice where the manufacturer lists it). Choose III for listed weight savings + suction cup + lower hicnshop price. Neither is “better” for everyone—match the table to what you actually use.
Specs table (manufacturer / retailer claims — verify live)
Figures below prefer hicnshop PDP tables when present. Extra claims from LETEN / other retailers are marked and may disagree.
| Spec | X9 III (3rd Gen) | X9 IV (4th Gen) |
|---|---|---|
| Listed price on hicnshop (observed 2026-11-05) | $127.00 | $145.00 |
| Materials (hicnshop) | ABS, TPE | ABS, TPE, silicone |
| Charging (hicnshop) | USB charging | Magnetic charging |
| Dimensions (hicnshop) | 80 × 80 × 310 mm | 100 × 87 × 275 mm |
| Gross weight (hicnshop) | 0.72 kg | 1 kg |
| Stroke speed (claim) | ~380 strokes/min on leten.co / Erotouch pages; not printed in the hicnshop attribute table | Up to ~580 strokes/min on hicnshop / 6ok6 / Durio |
| Modes / control (claim) | ~10 frequencies (5 speeds & 5 modes) on leten.co / Erotouch | Stepless / multi-level sensation copy on hicnshop; “10 telescopic modes” on some wholesaler pages |
| Heating (claim) | Not listed on hicnshop III page | “Intelligent heating” on hicnshop; ~40°C constant warmth on leten.co IV page |
| Voice / audio (claim) | Not listed | Moaning / voice listed on leten.co and some wholesaler pages; not in hicnshop IV key-feature list |
| Suction cup | 120° hands-free suction cup (hicnshop, leten.co, Erotouch) | Not listed on the hicnshop / 6ok6 IV pages reviewed |
| Stroke / channel notes | Marketed as long / “longest” stroke on III PDPs; no mm stroke length on hicnshop | leten.co lists 45 mm stroke length for IV |
| Waterproof / IP (claim) | Not listed on hicnshop | leten.co FAQ: not waterproof (do not submerge; sleeve removable). One wholesaler lists “splashproof”—conflict; trust the manual |
| Battery (claim) | Runtime not stated on hicnshop III table | leten.co: charge under ~45 min, ~45+ min use; Durio also cites ~45 min use / 1400 mAh / ≤75 dB—charge-time figures disagree across sites |
Treat the table as a shopping aid, not a lab report or a quote.
Naming note (“4 pistons”)
hicnshop’s III page describes an internal sleeve layout with “4 pistons + particles…”. leten.co’s III-vs-IV blurb says the III does not have the IV’s quadruple piston technology / modes. Read hicnshop’s III line as sleeve-channel marketing, and IV’s “quadruple / four levels” as stroking-mode marketing—do not treat them as the same feature.
Size, stroke feel, and “channel length”
On the outer dimensions hicnshop lists, the III is longer and lighter (about 310 mm / 0.72 kg) and the IV is shorter and heavier (about 275 mm / 1 kg). That does not automatically mean a longer usable stroke: IV is the SKU with an explicit 45 mm stroke figure on leten.co, while III leans on “ultra-long stroke” marketing without a mm number on hicnshop.
Practical read:
- If you care about compact hand feel + listed speed/heating, IV’s shorter, heavier chassis matches its feature set.
- If you care about lighter carry + suction-cup mounting, III’s listed weight and cup matter more than the IV’s heating copy.
For first-time piston buyers, also skim the beginner guide. If you are choosing between X9 and A380 instead of generations, use A380 vs X9.
Who each model suits
Pick X9 III (3rd Gen) if you want…
- A lower current list price on this storefront ($127 observed).
- A lighter listed unit (~0.72 kg).
- A 120° suction cup for hands-free angles called out on the PDP.
- USB charging with a simpler feature set (no heating listed on the hicnshop III page).
Shop: LETEN X9 3rd Gen
Pick X9 IV (4th Gen) if you want…
- The higher listed stroke-speed claim (up to ~580 strokes/min on this store’s PDP).
- Intelligent heating as listed (warmth for use experience—not a health claim).
- Magnetic charging and the IV’s multi-level / stepless control copy.
- Optional voice/moaning only if the unit you receive matches a manufacturer page that lists it—confirm on the box/manual; hicnshop’s IV bullets emphasize speed, stroke, and heating.
Shop: LETEN X9 4th Gen
Decision checklist
- Budget — III lists lower than IV on hicnshop today; confirm live price and stock.
- Hands-free — Need a suction cup? III lists one; IV pages reviewed here do not.
- Warmth — Heating is an IV listing point, not a III hicnshop attribute.
- Speed marketing — IV leads with ~580/min on this store; III’s ~380/min figure appears on other retailers, not the hicnshop attribute table.
- Weight / length — III lighter/longer on paper; IV heavier/shorter.
- Care — Plan water-based lube and sleeve cleaning before first use: cleaning guide.
- Authenticity — After delivery, verify the security label.
- Shipping — Overseas orders use discreet outer packaging when carriers allow; see Shipping policy.
FAQ
Does X9 IV replace X9 III?
IV is the newer generation with more listed features (speed claim, heating, magnetic charge). III stays useful if you want the suction cup, lower price, and lower listed weight. Stock both only if the SKU title on the cart matches what you meant to buy.
How do I charge them?
III: USB charging per the hicnshop table. IV: magnetic charging per the hicnshop table. Use the cable/adaptor that ships with your unit; do not invent third-party charge times as “our test results.”
What lube should I use?
Use a water-based lubricant with TPE/silicone sleeves. Avoid oil and silicone lubes unless the sleeve manual explicitly allows them—those can damage many soft sleeves. More detail: How to clean a LETEN masturbator.
Can I swap or wash the inner sleeve?
Manufacturer pages for these X9 cups describe a removable sleeve for cleaning (wash the sleeve; keep water out of the motor housing). Dry fully before reassembly. Follow the insert that ships with your unit if steps differ.
Is either model waterproof?
Do not assume full waterproofing. leten.co’s IV FAQ says the device is not waterproof and should not be submerged. One wholesaler lists “splashproof” for IV—that conflicts. Default to: wipe the housing, wash only the removable sleeve as directed, and trust your manual over blog copy.
Do these toys treat ED or medical conditions?
No. We describe devices with specs and care notes only. If you have a medical concern, talk to a qualified clinician—not a product page.
Next steps
- Open both PDPs and confirm today’s price, options, and stock.
- Add the generation you want → Shop or Electric masturbators.
- After delivery, check authenticity.
- Still torn between X9 and A380? Read A380 vs X9.
- Questions? Contact or WhatsApp +86 181 2243 3456.