Large display screen: Large digital LED screen, clear display, easy to read. Magnetic design: The magnetic design on the back can be stuck to any metal surface. /p> Thin and light design: 9mm thick, lightweight and portable, weighing only 24g. Memory function: Press STOP after the doorbell stops and it also helps us design the memory time when the doorbell stops. Next time, just press START to start timing. Easy to set: MIN indicates minutes, SEC indicates seconds, STOP/START indicates stop and start, just press the corresponding button several times to count the time required. Note: The data is all measured manually, please allow 1-3cm error due to the difference in light and display, there may be some color difference, please refer to the actual item received.