Smart Fingerprint Door Knob – 4‑Way Unlock with Bluetooth App, Keypad & Emergency Power

Upgrade home security with this smart door knob that offers four unlocking methods: fingerprint, digital password, mechanical key and Bluetooth app:contentReference[oaicite:120]{index=120}. Passage and privacy modes let you switch between free access and secure locking, while a low‑voltage alarm alerts you when the batteries need replacing:contentReference[oaicite:121]{index=121}.  

Designed for wooden or steel doors 35–55 mm thick, the knob includes a Type‑C emergency power port for temporary charging if the battery dies:contentReference[oaicite:122]{index=122}. An integrated keypad and LED prompt light guide you through setup, and the Tuya Smart app lets you add or delete fingerprints and passwords remotely:contentReference[oaicite:123]{index=123}.  

Ideal for bedrooms, apartments and offices, this smart knob brings convenience and peace of mind to any space.  

- **Four unlocking methods** – Unlock via fingerprint, password, mechanical key or Bluetooth app for ultimate flexibility:contentReference[oaicite:124]{index=124}.  
- **Passage & privacy modes** – Switch easily between free‑passage and secure privacy mode as needed:contentReference[oaicite:125]{index=125}.  
- **Low‑voltage alarm & emergency power** – Built‑in warning plus Type‑C emergency power port ensure you’re never locked out:contentReference[oaicite:126]{index=126}.  
- **Easy installation & wide compatibility** – Fits wood or steel doors 35–55 mm thick; suitable for homes, apartments and offices:contentReference[oaicite:127]{index=127}.  
- **App management & keypad** – Use the Tuya app to manage fingerprints and codes; illuminated keypad for quick code entry:contentReference[oaicite:128]{index=128}.