This lock uses an external sensor and has a 20" cord so that you can have the sensor in a different spot to scan to open the lock. The sensor is a snap in design and can be viewed on the outside. The sensor can also be hidden behind the wood to keep it all invisible, but the sensing distance is max 1".
The Management card and 2 user cards come programmed to the locks already!
2. Low voltage alarm: when voltage is lower than 4.5V, lock will prompt with sound and light every opening. If batteries die completely, lt will fail open and stay unlocked.
3. High frequency card: Mi-fare 1, 13.56MHz.
4. Anti-force strength: 250kgs.
5. Longer sensing distance: maximum 40mm (1.57")
6. Support various materials: wooden, plastic, etc.
7. Invisible style: can be installed inside of the door, which can not be seen from the outside.
8. There is long time unlocking alarm function. Press button 1 and button 2 simultaneously to enable/disable that function.