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KRASER KR7Y review

A disc lock with a 110 dB alarm on a rechargeable battery charged by USB-C, a ø7 mm pin, keyless push-cylinder locking and a three-second arming delay.

The bottom line A rechargeable alarm with a published warning sequence and a reminder cable. No independent security rating, where two of its neighbours have one.

What the seller commits to paper

A 110 dB alarm on a rechargeable battery with a USB-C cable supplied. A ø7 mm pin stated to suit all types of brake disc. Keyless locking — press the cylinder, alarm active in 3 seconds — and three warning tones when the lock detects an attack before it sounds fully. Automatic dust protection on the cylinder. A reminder cable.

Rechargeable is the right call

An alarmed disc lock running on a coin cell goes quiet without telling you. USB-C charging means the failure is visible and fixable with a cable you already own.

The warning sequence is a real detail

Three tones before the full alarm is what stops a lock screaming every time someone brushes past it in a car park. Publishing the behaviour rather than only the volume says how it will actually behave.

The rows this seller leaves empty

Any independent security rating. Sold Secure and ART are the two that appear elsewhere in this family, and neither is cited here.

Availability

Between 30 € and 35 € across the German, French, Italian and Spanish Amazon stores, in the single reading behind this page.

Priced in local currency, which the euro range above deliberately leaves out, it also appears on the American Amazon store.

An entry with nobody selling against it sits in the British Amazon catalogue.

What Keepa returned in the single reading behind this page. Availability and prices move without notice.

Prices quoted in this text were read on 18 September 2026. The live price is at the top of the page.

The declared figures, and the blanks beside them

Strengths

  • Rechargeable rather than running on a cell that dies unnoticed
  • Publishes the warning sequence, not just the alarm volume
  • Reminder cable supplied

Compromises

  • No independent security rating published, unlike two locks in this family
  • A rechargeable lock needs charging — a flat one is a lock without an alarm

Specifications

Alarm110 dB (from the title)
PowerRechargeable battery, USB-C cable supplied — no battery changes (maker’s bullet)
Pinø7 mm / 0.27 in, stated to suit all types of brake disc (maker’s bullet)
ArmingPress the cylinder, alarm active in 3 seconds; 3 warning tones on detecting an attack (maker’s bullet)
LockingKeyless — press the cylinder; automatic dust protection (maker’s bullet)
Security ratingThe maker puts nothing in writing on this — no Sold Secure or ART level is cited.
Amazon referenceB0BWF2YWZN (one reference across 6 Amazon marketplaces)
EAN8423885810076

What riders ask about this one

What is the reminder cable for?

It runs from the lock to the handlebar so the lock is in your eyeline before you pull away. Riding off with a disc lock fitted damages the disc, the caliper and usually the rider.

Does the alarm replace a rating?

No. An alarm is a deterrent; a security rating describes resistance to attack. Two locks in this same family publish a rating and this one publishes a decibel figure.

Who this one is for

A rider who wants an alarm and does not want to hunt for a coin cell twice a year.

Compared with its closest rivals

Same category, nearest prices. Only the specifications every one of them states are shown — a half-empty column compares nothing.

Model Price Amazon reference
KRASER KR7Y 30 € B0BWF2YWZN (one reference across 6 Amazon marketplaces)
Vemfay Alarm disc lock 20 € B0GZVGFF7M (one reference across 5 Amazon marketplaces)
Anykuu 3650 17 € B093P3F8PS (one reference across 5 Amazon marketplaces)
ABUS Element 303 12 € B08RK5JDBF (one reference across 6 Amazon marketplaces)

What separates these models

  • If price decides: ABUS Element 303, at 12 €.
  • Highest Amazon reference in the table: Anykuu 3650 (B093P3F8PS (one reference across 5 Amazon marketplaces)).

If this one is not the right fit

  • On a tighter budget: ABUS Element 303, at 12 € in the same category. see the review
  • If you need more Amazon reference: Anykuu 3650 states B093P3F8PS (one reference across 5 Amazon marketplaces). see the review

Value for money

At 30 €, it sits +50 % against the 20 € median of the 5 models in this category published here.

Guides that feature it

Price and availability

A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.

Details checked on September 18, 2026.

Sources

Specifications: manufacturer sheet and Amazon product page. Prices and availability: Keepa. No product on this site has been physically tested.

How we assess products