This alarm clock should always be connected to the USB, the battery is just a memory function [widely used] The children's alarm clock looks cute and easy to use. It can be used as wake-up light, multi-color night light, mood night light, atmosphere light, bedroom clock, indoor lighting, wake-up clock. [5 LED light colors and 5 sounds] Cadrim night light bedside clock has light alarm clock with 5 light colors and 5 sound adjustments. White, yellow, blue, purple and green. There are also 5 kinds of sounds for waking up children (birds, 3 kinds of children's lullaby, ticking sound). You can choose your favorite sound and wake you up gently at the right volume. [LED display & 2 time modes and 2 temperature modes] Cadrim children's alarm clock has an LED display to display the time, date and temperature, which are clear at a glance. There are two time formats, 12 hours and 24 hours, which can be adjusted. There are also two temperature modes Fahrenheit and Celsius. [Child-friendly material] The alarm clock is made of high-quality ABS material, which is really safe for your children. The cute clock is suitable as a birthday gift or a gift for Thanksgiving and Christmas. [Children wake up alarm clock] This is a fun and simple way to tell your child when to get up and go to bed. Seductive colored lights and soothing music can help your child fall asleep better. 1. I just bought this, plugged it in and removed the battery cover, but nothing happened.. There is no screen display or something? / Does anyone know how to keep the light on? / Why do all settings disappear after I unplug the clock? -This alarm clock should always be connected to USB, the battery only has memory functionAnd the alarm clock has a memory function, and there is no need to reset it after it is turned off. (But after you receive the product, you need to remove the battery insulation sheet)2. Why does my battery icon keep flashing? -This is because the battery insulation sheet is not pulled out3. I set the sleep/wake time, but it does not work? The instructions say to turn on the sleep trainer, but I cant find how/where to do this? -Please short press the sleep/wake button4. Does anyone know how to change the temperature to the default value of c'instead of f'? -Please long press the "Sleep/Wake" button5. Is there any place to download the user manual? The power went out, and now we can't reset the sleep mode to turn green when waking up. SleepThe blue light will light up 30 minutes before the sleep time. Tell your child it's time to go to bed. After 30 minutes, the lights will go out, the eyes will be closed, the moon icon will appear, and the LCD screen will dim, telling your child that it's time to go to bed. PlayThe yellow light will turn on your child, and you can set the alarm clock 30 minutes before the wake-up time to make sure your child wakes up, and the children can play in bed for 30 minutes. Wake upThe green light is on, it reminds the child that it is time to get up. The LCD eyes are opened, the sun icon appears, the green light is on for 1 hour, and the LCD screen returns to the brightness set last time. SnoozeWhen the snooze function is on, press and hold the SNOOZE button to check the remaining snooze time. When the snooze function is off, long press the SNOOZE button to view the alarm time. Child lockIn any mode, short press the LOCK key to lock all functions. Long press the LOCK key to unlock the clock. Ringtones3 kinds of piano light music, cuckoo bird song and "didi", the alarm time is 5 minutes. With soft piano music, bird song, white noise, children can enjoy the sound to fall asleep. Press the +/- button. Increase/decrease volume ThermometerTemperature display / (default -)Temperature range 32-122/0-50Accuracy 0.1/ Light5 color night lights white, yellow, blue, purple and green. 7 kinds of lighting time can be selected 10Mins 20Mins 30Mins 45Mins 60Mins 90Mins or constant light. AttentionBefore turning on the CR2032 button memory battery, please remove its insulation. The memory battery CR2032 can save your settings and time for up to 2 years in the event of a power failure. USB power supply5V power inputUSB 5V output Parcel1 * Alarm clock1 * 1.8m USB cable1 * Instruction Manual