Your information should provide how long (range) alkaline batteries might last when candles are on so they can be turned on by remote or on timer. These candles can eat batteries. The only way to find out is to eat some or to read reviews. Few reviews mention this. Otherwise the candles are quality and beautiful. They were delivered quickly and safely. I dont leave the switch on unless I will turn them on by remote or timer soon. After all they are safer than regular candles and dont tarnish silver like real candles. I have to light real candles one at a time too.