I've been using an old mobile as an alarm clock for years. It's UI is much easier than a clock-radio (I was never able to figure those out), you can change the

I've been using an old mobile as an alarm clock for years. It's UI is much easier than a clock-radio (I was never able to figure those out), you can change the song and volume and it has a builtin battery. It's most well-designed not-alarm-clock alarm I've ever had.