alarm clock for kids, baby children’s sleep training clock with wake up light, 5-color changeable night light, 5 alarm rings, temperature detect, nap timer, usb charging clock batlofty <b>notes</b><br><br> <b>temperature detection:</b><br> range:-10~50°c/14-122°f<br> if the temperature is out of the range,hhh(above 50 °c) or lll(below -10°c) will be not display.<br> 2.for safety purpose, there's a piece of insulated plastic located at the bottom of the battery, which needs to be pulled out before use.<br> 3.the usb data cable needs to be connected then the screen to light up.<br>