[Super Loud Alarm]: The 130 decibel siren can not only create a strong shock for thieves, but also wake you up from sleep to avoid terrible accidents. [Easy to use and install]: Wireless remote control, easy to use. Two installation methods, double-sided stickers or straps, no tools required. It is suitable for use in homes, apartments, mobile homes, offices, hotel rooms, garages and other entry warning systems. [Keep Your Children Safe]: This wireless magnetic door and window alarm sensor is powerful enough to detect entry, notify you when your children open the doors and windows to prevent children and babies to go out, no matter you are inside or outside the hotel. Especially if you have a swimming pool at home, it is very necessary to install a doorbell, and you do not have to change the battery frequently for a year. (battery not included) Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be some difference of color, depending on the physical object received Delivery quantity: (according to the main image)