This door open alarm for home/business/office /retail store /kids installs tool-free to nearly any
  door or window to notify you of any unwanted entry. The wireless and portable design allow you
  to install the wireless door entry alert in any section of your home, or business.
 
  Expandable (up to door sensor 40pcs)
  You can choose one for the front door and a different one for the back door. Then you will be able
  to distinguish which door is being opened.
 
  LED Indicator for the Hearing Impaired )
  Secrui entrance alert/ Exit alarm features a LED indicator that creates a visual LED alert, allowing
  the hearing impaired to take advantage of the system.
 
  Parameters of Doorbell Receiver:
  52 tones optional
  Colorful LED indicator
  Standby current :

Product Features

• 【Wide Working Range】:This door window open alarm is up to 400 ft in open area, wireless door open chime for business will automatically trigger the receiver when the magnetic strip is separated and the receiver will alerts immediately whenever the door or window is opened
• 【24/7 Lifeguard for Your Family】: This room door sensor alerts when burglar opens door and helps deter break-ins(wireless garage door sensor activates when magnetic sensor separates)
• 【Easy to install】:Just plug the doorbell receiver into any standard outlet and tear the double- sided adhesive tape which on the back of door sensor( or screw mounted) and stick them to the door or window is fine,please take the insulating paper away before using the sensor.
• 【52 Music with Mute to Loud dB】:5 levels of adjustable volume from 0-110 dB.Offer 52 elegant music from the traditional”Ding Dong” to various well know chimes.Memory function: Keep the previous setted tune after re-plugging it
• [LIMITED LIFETIME WARRANTY]:With our 100% risk-free satisfaction guarantee on the Secrui Open Door Alarm for Kids, you’ve got nothing to lose; our priority is to make sure we provide you a premium quality product; if you are not satisfied with the door sensor homekit, please don’t hesitate to contact us for a refund or replacement within 18 month of purchase