[ materials] - This remote control door lock comes with a rust-proof battery box, and the spring is made of special materials, which is sturdy and . 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. [Induction lock] - 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. [Power saving control mode] - 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. [Easy to install] - 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. [Wide application] - The remote control adopts a digital dialogue system that cannot be decoded or copied. It is very suitable for offices, homes, els, security doors, hall doors, wooden doors, garage doors, etc. Colour:Silver&Black Material:Iron plating + zinc alloy + stainless steel Package Contents: 1 x 4 x Remote control(with battery) Only the above package content, other products are not included. 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.