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Description: This is a set of multifunctional door magnetic alarms, mainly used to protect doors and windows. Made of high-quality plastic and metal materials, strong and durable. Super loud 130 decibel anti-theft alarm. Easy to install and easy to use. It is suitable for many occasions such as family, apartment, office, hotel room, garage and so on. Specification: Material: Plastic + Metal Size: Door Sensor: 65x34x16.5mm/2.56X1.34X0.65inch Magnetic Stripe: 36x10x14mm/1.42x0.39x0.55inch Package Includes: 4 Pieces Alarm Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!