Backlight function: The bedroom clock has a backlight so you can read the time at night or when it's dark. Practical and convenient. Press the button to activate the backlight in the dark. Specifications: The clock measures 6.5inch high, 4.5inch wide and 2.5inch deep. Height is about 16.5cm, clock face diameter is 10.5cm. Metal frame, 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 sound for sleepers and those who have trouble waking up. No snooze button. Perfect for adults, teens, children and seniors. Easy to use: Analog clock setup is simpler. It keeps time well. Battery powered, no power cord required, portable for travel. Kids can use this alarm clock too. High-quality: Iron case, solid glass, luminous numbers. Vintage double bell, classic style. Ideal back-to-school gift for teens or kids. Color as shown in images. Material: Metal+ABS+Glass. Package Contents: 1 x Alarm Clock (other products not included). Note: Light reflection and different displays may cause slight color difference. Measurement allowed error is +/- 1-3cm.