Backlight function: The bedroom clock has a backlight so you can read the time at night or when it's dark. Practical and convenient. Ever wake up in the middle of the night wondering what time it is? Simple on/off to activate alarm settings. Turn the knob to set the clock time and alarm time. Press the button to activate the backlight in the dark. Specifications: The clock measures 6.5 inch high, 4.5 inch wide and 2.5 inch deep. Metal frame, midnight black matte finish, built-in backlight. Powered by 1 AA battery (not included). For longer life, we recommend using non-alkaline batteries. Bell Alert: High quality smooth sweep quartz movement. Super loud siren sound for sleepers and those who have trouble waking up. No snooze button. Suitable for adults, teens, children and seniors. Easy to use: Analog clock setup is simple. It keeps accurate time. Battery powered, no power cord required, portable for travel. Kids can use this alarm clock too. High-quality alarm clock: Iron case, solid glass, luminous numbers, durable design. Vintage double bell alarm clock with classic style. Ideal for back-to-school use, helping teens and children learn to manage their time and wake up independently. Color: Black Material: Metal + ABS + Glass Size: Height is about 16.5 cm, clock face diameter is 10.5 cm Package Contents: 1 x Alarm Clock Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.