Features: User-friendly interface, easy operation, stable performance, regular work. Stylish, safe and durable, integrated design, convenient to install. EM contactless card, the sensing distance is greater than 20mm. Two open solutions: single card solution and dual card solution. Sound and light indicate when it works, and the blue light will glow gray when the battery is low. It will automatically return and indicate that it is a blocker when there is an obstacle. Widely applicable to swimming pools, sauna bathing places, golf courses, gym lockers, business, schools, hotels, supermarket lockers, etc. Setting Method 1.Single card opening: Induce once with management card. When the blue light flashes, induce guest card. After the flashing stops, the guest card can open the door. Note: If a guest card is set up with the management card, the new guest card can open the door, and the previous one's unlocking function is automatically cancelled. 2. Double card opening: Continuously induce twice with the management card. When the blue light flashes, induce waiter card. After the flashing stops, the guest card and the waiter card can be used to open the door. Note: To set up multiple waiter cards, you need to set them continuously after the management card raise two "di" beeps. Specifications: Condition: Brand New Material: Zinc alloy Color: Shown as picture Card Type: ID card Power Type: 4 * 1.5V alkaline battery (excluded ) (with external power supply) Anti-static: > 15000 V Card Reading Time: 15 months Low-voltage Directives: 4.8 V Working Temperature: -40~ - 85 degrees Static Power Consumption: