You won't sleep through this alarm. Sometimes the old-fashioned way is best. The Twin Bell is loud enough to wake you from a deep sleep and sounds great doing it. Your loss for this alarm clock is nothing compared to potentially losing a job by being late for work all the time. If you are a deep sleeper, hard of hearing or hearing impaired, and it takes a few minutes to wake you from a deep sleep, this alarm clock is for you. 【High-Quality Materials】The finely crafted, durable metal casing gives this alarm clock a sturdy feel. The clear glass dial clearly displays the time. The square shape ensures stability when placed on a flat surface. 【Silent, No Ticking】The sweeping second hand makes no annoying noise; it is completely silent and perfect for both work and sleep environments. 【Luminous Function and Backlight】The clock's dial and hands glow all night after exposure to normal indoor light or sunlight for a full day. You can see the time at night on the constantly illuminated dial. A light bulb is built into the clock, and you can also press the button to activate it for night viewing. 【Extra Loud Alarm】The extra loud alarm sound is ideal for deep sleepers and those who have difficulty waking up. There is no snooze button, making it suitable for adults, teenagers, children, and the elderly. 【Easy to Set】Simply turn the On/Off button to start setting the alarm. Turn the dials to set the clock time and alarm time. Press the button to activate the backlight in the dark. 【Good Design】Size: 6.2 \" x 4.5 \" x 2.1 \" Power supply: 1 * AA battery (not included)