Mechanical power supply: no battery, economical and convenientTime delay range: 1 minute to 60 minutes can be arbitrarily adjusted, simple operation, 2 steps to complete the adjustmentRinging duration: 3 to 5 secondsScope: living room, bedroom, study, office, kitchen, bathroom, public places.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 specificationsWe 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