Anywhere in the house: Protect your home in different locations with 4 alarms: front door, balcony, garden, bedroom and window. Easy installation: The alarm requires no tools or cables. Simply attach it to the windowsill or door frame with the included adhesive strips. The magnet does the rest. Sirens: Small, practical and versatile. If the design does not affect the beauty of your room. Note: Make sure that your apartment or house has the right conditions to install a security system and that it cannot be triggered properly (the distance between the transmitter and the receiver should not exceed 10 mm). Dimensions Transmitter: 9 x 3 x 2 cm / Receiver: 5 x 1 x 1.5 cm Battery: 2 AAA 1.5 V for siren (both included) Volume: 120 dB Maximum distance between transmitter and receiver: 10 mm Package includes: 4 wireless alarms, 4 magnetic receivers