A. This remote control door lock comes with a rust-proof battery box, and the spring is made of special materials, which is sturdy. The lock ring and main parts are made of stainless steel and not fade. Beautiful appearance, arc design, and the lock body is relatively thin. B. Our door lock access control system is unlocked by the remote control, and then the door is closed, and it automatically lock after 3 seconds. The remote control distance is 0-10 meters. The unlocking methods include remote control unlocking and key unlocking. C. Low power consumption, each remote control is equipped with an AA battery, and the needs to prepare 4 x AA batteries (not equipped in the product), which can provide super long working time. This has a long service life and 300,000 locking operations without wear. D. Easy and safe installation with an external mounting plate. Remote control with a digital dialogue system that cannot be decoded or copied. Innovative release and lock sound. Easy to install without insertion. E. The remote control adopts a digital dialogue system that cannot be decoded or copied. It is very suitable for offices, homes, hotels, security doors, hall doors, wooden doors, garage doors, etc. F. Colour:Silver&Black G. Material:Iron plating + zinc alloy + stainless steel H. Package Contents: 1 x 4 x Remote control(with battery) Only the above package content, other products are not included. I. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.