1. The inside-set controlled-circuit can efficiently avoid the man-made damage and unlocked by the outside power-supply.

2. European style, handsome and attractive shape.

3. Controlled by micro-motor, consume less energy.

4. Use proximity, convenient for hotel management.

5. Microwave induction-inspecting way, no influence by exterior ray.

6. Quick response when reading cards.

7. Work with lithium battery or alkaline battery; Lock body can use TG5#; TG3#; TG1#