1/2/4PCS Mini Door Window Sensor Magnetic Home Hotel Wireless Security Burglar Alarm Features ltra-thin design, the back of the product adopts high viscosity sticker, which can be installed on any door or window. High-precision materials, never false alarms. When the distance between the host and the magnetic stripe exceeds 10mm, an alarm is immediately issued. Low voltage reminder to remind you to replace the battery in time to protect the safety of you and your family at all times. The host and magnetic stripe are attached to the door panel and door frame respectively. Turn on the rocker switch on the left side of the main unit, the door will alarm when the door is opened, and the switch can be turned off when the alarm is not needed. Remind yourself immediately when someone enters. Prevent theft when no one is home, and the loud alarm will scare the thief, so you can sleep well at night without worrying about the intruders Specifications Package including: 1/2/4PCS * Door sensor Note: Duration for different personal measurement methods, there will be an error of 2-4cm, please understand Thanks for your support Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store