Product parameters: Material: Plastic Color: Black Product size: 13.5 * 3 * 8cm Power supply: 2 x AAA batteries (not included) or USB power cable (included) package contents 1 x projection alarm clock 1 x USB cable 1 x English user manual 1. Improved projection function: Simultaneous display of time and temperature. And adjustable projection directions and angles make it easier to read all information from all angles. The projection function is always retained when connected to the power supply and can be controlled with the on and off buttons. 2. USB charging function snooze function: When the projection alarm clock is connected to the power source, the left USB port can charge the phone or iPad. While the alarm is sounding, touch the Light / Snooze button to activate the snooze function. The alarm will sound again after 5 minutes. Then press any key to interrupt the snooze function. 3. Easy to use portable: The clock has two modes of operation: it can be plugged into the mains at home and can be installed with 2 AAA batteries (not included) when going out. And its size and power consumption are small, it is easy to carry and use. 4.BacklightAfter inserting the battery, touch the top of the watch to turn on the backlight . Through the USB cable, the product backlight has four brightness modes: high/medium/low/off. Change the mode with each touch. And it can stay on all the time.