1/2pcs 4 In 1 Door Alarm Security Alarm 3/15/30/60 Seconds Wireless Fridge Doorbell Sensor Alarm Features General alarm (alarm stop if door closed); Door opening chime (sounds DingDong once the door is opened)Loud 108dB alarm: Door and window alarm helps effectively deter intruders/ thieves with a loud 108 dB alarm. You can easily set the suitable mode according to your needs. Easy to Install: Simple peel and stick installation, easy to install on most freezer/refrigerator or any door without any tools. Widely Used: Magnetic Trigger Door Alarm Sensor Protecting Home Through Door Window Entrance and Suitable for Safe, Cabinet, Freezers , refrigerators, swimming pool sliding door, shop, office, apartment, hotel, etc. Specifications Battery: 2*AAA batteries(not include) Package Include:1/2PCS*Door Alarm Note: Due to different personal measurement methods, there will be an error of 2-4 cm, please understand Thanks for your support When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it