Door And Window Contact Sensor: This Magnetic Door And Window Alarm Will Sound A 130 Db Volume Chime When The Door Is Opened. It Can Prevent Your Children From Sneaking Around. And ItS A Perfect Anti-Theft Wireless Security Magnetic Alarm For Child Safety, Home, Garage, Mailbox And Business Security 4 Alarm Modes: It Has 4 Alarm Modes: 1 Ordinary Alarm Mode (Alarm Will Sound 1 Minute If The Door Is Opened); 2 Wireless Doorbell Mode (Ding Dong, Sounds Once As A Welcome Tone); 3 Alarm And Stop Mode (Sounds Loudly If The Door Is Opened, And It Will Stop As Soon As Your Door Is Closed); 4 Door Close Reminder (Di Di) Mode, From Bottom To Top, It Will Remind You With Repeated Sound Until The Door Is Closed) Easy To Install: This Security Kit With Home/Window Alarm Comes With Self-Adhesive Pads, So No Tools Are Required, Just Stick The Sensor And Alarm To The Door Or Window. It Can Also Be Used As A Door Stop Alarm, Swimming Pool Door Alarm, Garage Door Alarm Or Sliding Door Alarm Automatic And Fast Switch: With An Ultra-Sensitive Magnetic Sensor, This Alarm Kit Can Quickly Detect If Your Door Or Window Are Open. Powered By 2 Aaa Batteries (Not Included) Worry-Free Purchase: Every Customer Is Important And Will Enjoy 24/7* Online Service. We Also Offer A 12-Month Warranty. Do Not Hesitate To Come Back To Us In Case Of Problem