The built-in calendar, automatic adjustment for the summer time or standard time. Alarm clock sound is gradually expanded rather than the same volume, in case people wake up. Easy to read backlit LCD display, built-in FM / AM radio tuner and 10 preset stations, speaker output power: 100 MW, 10% harmonic distortion, Autoclock technology enables automatic time setting and automatic daylight saving time adjustment, USB smart charging, 3 levels of brightness control.