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. Speclflcatlons: The clock measures 6.5inch high, 4.5inch wide and 2.5inch deep. Metal frame, midnight black matte finish, built-in backlight. Powered by 1 AA battery. (not included in the package). For longer life, we recommend using non-alkaline batteries. Bell Alert: High Quality Smooth Sweep Quartz Movement. rang. Super loud siren 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. It's battery powered and doesn' require a power cord, you can take it anywhere or even as a travel clock, kids can use this alarm clock too. High-quality alarm clock: Iron case, solid glass, luminous numbers, durable, accompany you every day. Vintage double bell alarm clock, classic style, timeless fashion. This classic clock is perfect as a back-to-school teens or kids, allowing them to have their own time and they can get up on their own. It's a great growing up. Colour:White Material:Metal+ABS+Glass Size:Height is about 16.5cm, clock face diameter is 10.5cm Package Contents: 1 x Alarm Clock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.