Thumb Turn Monitor - AddOn - Locksure - First Retrofitted Lock State Detector

▶️ Watch Setup Video

🚪 Already have a Locksure Hub? This is all you need for your next door.
Just stick on and pair — your existing hub picks it up automatically via Bluetooth.

📋 Technical Specifications

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Fits over the profile of exposed barrel (must be at least 1mm exposed)
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Single device monitors locking and unlocking from both sides of the door
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Connects to your existing Hub — no extra hub needed
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We recommend max 2 doors per hub (unless doors are very close together)
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Bluetooth Low Energy Radio — 5 to 7 metre range
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1.5 year battery life (CR2032 coin cell)
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Ready for open/close detection (magnet accessory required)

⚠️ Hub Range & Placement

We recommend a maximum of 2 doors per hub for the most reliable performance — unless your doors are right next to each other (e.g. front and side door in the same porch). Each hub has a Bluetooth range of 5–7 metres — walls and floors reduce this. If your additional door is further away, consider our 2-Door Bundle which includes its own hub for a separate zone of the house.

⭐ Customer Reviews

“The visual flash of the LEDs alone when I lock the door really stick in my memory. Locksure has been on my door for over six months now and I want to keep it!”

— Jason, Stevenage ⭐⭐⭐⭐⭐

“We have a three story house and, just before bed, I get paranoid if I remembered to lock the door. No more with Locksure, I just check the app and have peace of mind.”

— Belinda, Slough ⭐⭐⭐⭐⭐