1. Broad application A practical alarm designed to prevent energy waste and improve safety. The device works seamlessly with air conditioners and refrigerators and has versatile applications that address common door related inefficiencies. 2. Efficient door monitoring Built in sensors identify the open or closed status of freezer doors and windows. It provides voice alerts for forgotten closures to prevent energy waste and ensure efficient operation. 3. Easy installation Multiple installation options, adjustable volume settings, and a user friendly design enable seamless use in any freezer environment. No technical skills required. 4. Efficient energy management Designed for energy conscious households, it minimizes power consumption with an energy efficient design that meets modern demands for resource conservation and operating efficiency. Use scenarios - Home kitchen: Use in households to prevent energy waste when freezer or fridge doors are left ajar during busy days, trips to the grocery, or late night snacking. Voice alerts help remind users to close doors promptly. - Small business or office: Suitable for beverage coolers or display freezers in cafes, offices, or break rooms. Quick alerts reduce downtime and energy costs by ensuring doors are closed after use. - Shared or seasonal spaces: Effective in apartments, dorms, or common areas where doors may be forgotten during busy periods or high traffic, helping protect appliances and lower overall power use.