One second to 24 hour positive countdown with clock memory function, two sets of countdown functions. With sound, it can be turned on or off (that is, it can be muted). Operation: press the "reset key" in time mode to switch the sound With power off and power on function, long press the "Start/Stop" key for 3 seconds in time mode to power off, and press any key to power on. The settings in power off and power on will not be cleared With daily alarm clock function, the alarm clock can be turned on or off Both groups of countdown have the memory function of the last setting It can also be used as an alarm clock for offices, bedrooms, study and living rooms. Different settings can be made according to different needs, which is convenient and fast. Package list: 1 * timer (package does not contain battery) We only sell timers, not other items in the pictures. Due to the difference of different monitors, the pictures may not reflect the actual color of the product. Please allow fine size due to manual measurement