U81 Electronic Door Lock Cylinder
The U81 Smart Lock is a retrofit smart cylinder lock designed for European-profile doors, allowing users to upgrade existing locks without replacing the full door hardware. The U81 combines biometric and electronic access control with a cylinder-based installation format and supports multiple unlocking methods including fingerprint recognition, PIN codes, RFID cards, smartphone app access, Bluetooth credentials, and mechanical backup keys. Designed for homes, apartments, offices, Airbnb rentals, and holiday properties, the U81 integrates with the WELOCK mobile ecosystem for temporary access sharing, audit logs, remote management via optional Wi-Fi gateway, and app-based credential control. The lock features an IP65-rated weather-resistant design, quick DIY installation, and compatibility with most Euro-profile doors.
WelockAmericas
United StatesWELOCK official shop (main / EU-facing)The visitor can buy from WELOCK official shop (main / EU-facing) — the manufacturer's own shop, which does serve them and does stock this device.CanadaWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.MexicoWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.BrazilWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.Western Europe
United KingdomAmazon GBIrelandAmazon GBFranceWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.GermanyWELOCK official shop (main / EU-facing)The visitor can buy from WELOCK official shop (main / EU-facing) — the manufacturer's own shop, which does serve them and does stock this device.AustriaWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.SwitzerlandWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.BelgiumWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.LuxembourgWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.NetherlandsWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.Southern Europe
ItalyWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.SpainWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.PortugalWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.Asia-Pacific
JapanWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.AustraliaWelock pageNo retail listing and no manufacturer shop serving this country, so the visitor is sent to the manufacturer's product page — which informs rather than sells.Automate the Welock U81 Electronic Door Lock Cylinder with Seam and start managing your devices today.
U81 Electronic Door Lock Cylinder
Control This Device With Seam API and TTLock
Connect your TTLock with Seam API to use these features.
Capabilities
What you can do with this device, using Seam API.
Device Connectivity
Additional equipment needed to remotely connect to this device.
Device Bridge
RequiredTo remotely interact with this device, you will need to pair it with a compatible bridge.
Automate Access with Welock U81 Electronic Door Lock Cylinder
A core use case is syncing access codes with reservations from your booking system. With Seam, you can plug calendar tools like Calendly, Cal.com, Google Calendar, and iCal; e-commerce backends like WooCommerce or Shopify; or even class- or appointment-booking software like Mindbody and Acuity. Every confirmed reservation can be set to automatically create a unique, time-bound code on the U81 Electronic Door Lock Cylinder at check-in and revoke it at check-out—no manual handling, no shared codes.
The U81 Electronic Door Lock Cylinder by Welock can be used to automate secure access for your customers, guests, or users using Seam's self-serve solution.
With support for time-based access codes, you can automatically grant and revoke access based on real-world events like bookings, schedules, or user actions—without manual intervention.
This is especially useful for:
- Short-term rentals (Airbnb, vacation rentals): automatically generate unique access codes for each guest stay, and revoke them at checkout
- Paddle clubs and sports facilities: grant access to courts or gates based on reservation times
- Golf practice ranges and leisure venues: control access to specific areas depending on bookings or time slots
- Music studios and recording booths: issue time-bound codes valid only during the booked session, with automatic revocation after
- Small businesses and studios: manage employee or customer access without physical keys
- Shared spaces and small offices: assign temporary or recurring access to members or staff
Using Seam, you can connect your U81 Electronic Door Lock Cylinder, listen to events from your booking system or backend, and programmatically create access codes that are valid only during the desired time window.
Control Access Remotely with Welock U81 Electronic Door Lock Cylinder
The U81 Electronic Door Lock Cylinder by Welock supports remote unlocking via the Seam API.
Beyond admin or staff workflows, you can embed an "Unlock" button directly inside your customer-facing app, allowing authorized end-users to open a door, gate, or locker themselves during their reservation or membership window—no front-desk hand-off required.
This pattern works particularly well for:
- Spas, wellness, and yoga studios: let members unlock treatment rooms, lockers, or studios on arrival
- Golf practice ranges: unlock bays, ball machines, or driving-range gates from the customer's app
- Tennis and racquetball clubs: authorize court access during the booked time slot, with no front-desk hand-off
- Fitness studios and gyms: give members 24/7 self-service entry tied to their active subscription
- Co-working spaces and shared offices: let members open the front door or private suites from a branded app
You can also trigger unlock actions programmatically—for example:
- Add a button in your app or admin dashboard to unlock a door or gate
- Allow staff to remotely grant access during a reservation
- Enable backup access in case a user cannot use their code
- Build simple interfaces for operators to manage access live
Combined with scheduling or reservation logic, this allows you to create flexible access experiences—for example, enabling a "Unlock" button that only works during an active booking time window.
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