Received this as a shower gift and it is a lifesaver.It is true that if you have motion going it uses more energy from the batteries -- duh!The light is bright, that's why they call it a nightlight; if you don't like it, turn it off.The light is blue and VERY calming.The sound can be adjusted to three levels.It straps SECURELY to side or end of crib. (I read another review that said they have a hard time with the straps BUT was changing batteries at 3am in the dark with a screaming kid; try changing batteries sooner, like 6pm)It has wonderful bubbles for baby to see and hear -- just like my fish aquarium = soothing!It goes for 18 minutes and I've only gone back in maybe three times to restart.I've had it 8 months, changed batteries twice (so 3 sets batteries in 8 months)Never leaks and baby DOES kick it a lot, using feet to turn on and off.Absolutely the SINGLE MOST IMPORTANT ITEM bought or received, including the crib.