Specification: Features: User-friendly interface, easy operation, stable performance, steady work. Stylish integrated design, safe and durable, convenient to install. EM contact card, the detection distance is more than 20mm. Two open solutions: single card solution and dual card solution. The sound and light indicate when it's working, and the blue light turns gray when the battery is low. It will automatically come back and indicate that it is a blocker when there is an obstacle. Widely applicable to swimming pools, saunas, playgrounds, gym lockers, businesses, schools, hotels, supermarket lockers, etc. Setting method 1. Single card opening: induce once with management card. When the blue light flashes, induce the guest card. After the flashing stops, the guest card can open the door. Note: If a customer card is configured with the management card, the new customer card can open the door and the unlock function of the previous one is automatically canceled. 2. Double card opening: continuously induce twice with the management card. When the blue light flashes, induce the server card. After the flashing stops, the client card and server card can be used to open the door. Note: To configure multiple server cards, you must configure them continuously after the management card emits two "di" beeps. Specifications: Condition: Brand New Material: Zinc Alloy Color: Shown as picture Card Type: ID Card Power Type: 4 x 1.5V Alkaline Batteries (Excluded) (with external power supply) Anti-Static: >15000V Card reading time: Working humidity: relative humidity 15% ~ 85% Battery life: >15 months Low voltage guidelines: 4.8V Operating temperature: -40 ~ - 85 degrees Static power consumption: Power Consumption: Size: Shown as picture Package Weight: Approx. 247g/8.7oz Package List: 1 * Panel 1 * Lock Body 1 * Lock Latch 1 * Induction Board 1 * Screw installation 1 * opening hole drawing Note: 1. Accessories of each lock: 1 customer card, 1 external power supply box. 2. If the lock does not have enough power and fails to open the door, you can power it with the external power box connection panel to open it. 3. Only use AA alkaline paste, rechargeable battery cannot be used.