High quality. Suitable for wooden and metal doors. Made from durable aluminum alloy material for long-lasting use. Operates without external interference, providing stable and safe performance. Features an adjustable time delay of 0, 3, or 6 seconds. Product Specifications: Working Voltage: DC12V Lock Mode: Magnetic induction Dimensions: 150 x 34 x 28 mm Working Current: Start-up: 1.2A, Operating: 0.25A Unlock/Lock Function: Unlock when power off / Lock when power off Color: Silver Material: Aluminum alloy Note: Items from different production batches or with different codes are compatible and will not affect functionality. Package Contents: 1 x Main lock 1 x Secondary lock (Only the above items are included. Other items shown are not part of the package.) Note: Slight color differences may occur due to lighting and display variations. Measurement error allowed within +/- 1-3 cm.