Bold Smart Lock - SX-35 Keyless Cylinder Smart Door Lock

The Bold Smart Lock SX-35 Keyless Cylinder Smart Door Lock replaces your existing euro-profile cylinder so you can open your door with your smartphone instead of keys. It installs in just a few minutes and is sized to fit doors with an indoor (thumb-turn side) length of up to 35 mm and an outdoor (knob side) length of 50-65 mm, with included size extenders for a precise fit.

Operated over Bluetooth through the free Bold app, the lock lets you grant, schedule and revoke access for family, staff, cleaners or guests from your phone, with a three-year activity log and support for unlimited users. Forgotten your phone? Open the door with a preset PIN entered on the knob. The weather-resistant IP54 outer knob runs on a CR123A battery delivering up to 20,000 operations (around two years), and the lock carries the highest SKG*** burglary-resistance certification with bank-grade encryption. Add the Bold Connect module for remote control over Wi-Fi.

Key Features

• Keyless Smartphone Entry: Open your door from the free Bold app over Bluetooth - no keys required.
• Easy Retrofit: Replaces a standard euro-profile cylinder in minutes, with size extenders for a precise fit.
• Full Access Control: Grant, schedule and revoke access for unlimited users, with a three-year activity log.
• PIN Backup: Open the door with a preset PIN on the knob if you don't have your phone.
• Certified Secure: Highest SKG*** burglary-resistance rating with bank-grade encryption and two-factor authentication.
• Weatherproof & Long Battery: IP54 outer knob; CR123A battery lasts up to 20,000 operations (about two years).
• Remote-Ready: Add the Bold Connect module for Wi-Fi control and notifications from anywhere.

Technical Specifications

• Type: keyless smart euro-profile cylinder lock
• Connectivity: Bluetooth (free Bold app for iOS and Android)
• Indoor (thumb-turn) length: up to 35 mm
• Outdoor (knob) length: 50-65 mm (adjustable with included extenders)
• Access methods: smartphone and PIN code; scheduled and temporary access
• Security: SKG*** certification; end-to-end encryption and two-factor authentication
• Outer knob: IP54 weather resistant
• Battery: CR123A, up to 20,000 operations (around two years)
• Remote control: optional Bold Connect (Wi-Fi)
• Model: SX-35

Use Cases

• Keyless entry for homes and flats
• Offices and businesses managing staff access
• Rentals, holiday lets and Airbnb with scheduled guest access
• Temporary access for cleaners and deliveries
• Retrofitting doors with an existing euro-profile cylinder