B4 Smart Fingerprint Bedroom Lock – Compact, Secure, Convenient

🔐 Unlock via fingerprint, PIN, RFID card, or mechanical key 📶 Optional Bluetooth/Wi‑Fi app control for remote locking 🔋 Runs on 4 AA batteries with low-battery alerts & USB backup 🛡️ Sleek compact design ideal for interior bedroom or office doors 📏 Fits standard wooden, steel, or aluminum doors (35–55 mm thick)