Very useful and alarm is loud enough to serve its purpose. Only down side is it can not be switched off to save the charge so if you only need it as an alarm clock for say Monday and Thursday you have to charge it twice as the charge only last 72 hours. If it could be turned off when not needed it would also add to the longevity of the clock as I am assuming the built in battery will stop holding a charge after many times being recharged. Other than that it seems to be perfect as a portable alarm clock.
The clock radio is very good Quality and the radio receiver is also very good Quality. I have it in the bathroom.
There is only one thing you have to remember is to charge the battery every couple of days.
Very pleased.