[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 durable. The lock ring and main parts are made of stainless steel and will 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 will 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 smart lock needs to prepare 4 x AA batteries (not equipped in the product), which can provide super long working time. This smart lock 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, hotels, security doors, hall doors, wooden doors, garage doors, etc. Colour:Silver&Black Material:Iron plating + zinc alloy + stainless steel Package Contents: 1 x Smart lock 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.