Feature: 1. LED CLOCK: 3D LED wall clock is perfect for your living room, bedroom, office, gym, workplace, basement, etc. 2. MULTIFUNCTION: Digital wall alarm clock timer has 12/24 hour display, time, temperature, alarm clock, and night light. 3. USB CABLE POWER SUPPLY: Small digital clock is powered by a USB cable and the cord can be hidden behind the clock. Looks cool to decorate your home or workplace. 4. REAL TIME TEMPERATURE SENSING: LED alarm clock has a top sensor design, which can feel the current temperature at any time and provide you with a reference. 5. DUAL POWER SUPPLY: When the external power supply is turned off, the internal power supply starts to supply power, and the clock is timing normally without fear of time data loss. Specification: Item Type: Clock Material: ABS Size: Approx. 23x9.3cm / 9.1x3.7in Gross Weight: Approx. 229g/8.1oz Battery: 1 x CR2032 Button Cell (Included) Power Supply: USB Power Supply. Package List: 1 x Clock 1 x USB Cable1 x Instruction Manual Note: 1. Please allow some error due to manual measurement.2. Memory function, will keep the time data when the power is off, no need to plug in again to set the time.3. The built in battery records time in the event of a power failure, and the clock is powered by the USB cable only.4. Please read the instruction manual before using this product and keep it in a safe place for future use.5. When the external power supply is turned off, the internal power supply starts to supply, the clock is timing normally, but the LED screen has no display and enters the power saving mode.