1.Intelligent Protection: This intelligent alarm system protects the doors and windows of your home.Thanks to a set of 4 alarms, it offers optimal security in different areas of your home: front door, balcony, garden, bedroom, window.2.Easy Installation: No tools or cables are required to install the alarm.Simply stick the alarm to a window sill or door frame using the included adhesive strips.The magnet operation does the rest.3.Practical DesignSmall alarms are practical and discreet.Their white design fits perfectly into any type of interior without compromising the aesthetics of your room.4.Note: Make sure your apartment or house has the right conditions to set up the security system without accidental triggering.The distance between transmitter and receiver must not exceed 10 mm.5.Specifications: The dimensions of the transmitter are 9 x 3 x 2 cm and the dimensions of the receiver are 5 x 1 x 1.5 cm.Each alarm works with 2 1.5V AAA batteries (included) and emits a volume of 100dB.The scope of delivery includes 4 wireless alarms, 4 magnetic receivers and 8 AAA batteries. 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